JumPan2 preamp by Wabun

Show your support by arranging an audition and if it is good, buy one. Support our local talents and hopefully we can produce a world class electronics producer.

I have purchased a unit already.

Good work rocketman!
Let's hear your review...

wabun wrote:
http://sites.thestar.com.my/audio/story.asp?file=/2010/1/11/afreviews/5415356&sec=afreviews

Some excerpts (and comments in blue & yellow):

External build quality and QC were disappointing. The chassis was
flimsy (“like a Milo tin”, said one visitor) with audible clunks heard
through the loudspeakers when tapped. A three-position selector switch
with “Aux” marked as a third input on the front panel was also
featured, yet Jum.Pan 2 only has two inputs! (MM plus line or two line,
according to order)! The line inputs were wired with channels reversed. (opps!)

...the build offered even on local fare from the likes of Audio Image and Frank Acoustics, for example, leaves this unit wanting. (awwww... wabun, don't be sad ... next round, i intro you to Frankie Voon ok ? take u go visit him at OUG area....)


The preamp picked up clacks and crackles from fluorescent lights and
fan speed switches when I used it away from my listening room’s
dedicated spur. Pan Labs advises plugging it in the first slot of the power gangway to minimise such effects. (Have to plug into the first slot ?? Y.G.B.S.M.)

The Jum.Pan 2 was tested with various power amps, (blah blah blah), and
via the theatre throughput into the power section of a Krell KAV-300i
integrated amplifier. (Hmmm.... Interesting! Exactly what I had in mind earlier... )

Bass was quite deep, but not as firm as when being driven by, say, the Krell’s own preamp section, but gave no cause for worry.
('Nuff said. No need to test with my KAV-300i anymore. Lets not Waste each other's time)

OK.... lets see... who's gonna pay RM1500 for something thats build like a milo tin, with audible pops/clunks when tapped ?? (Yo Wabun !! Loose connection inside or some dry solder joints issit? Lemme know lah bro, i sponsor you a decent Soldering iron ... Hakko brand OK for you ? ) Oh! Looks like someone actually did!

I'll sponsor u some free ferrite cores to make it more "fluorescent lamp" resistant also ok? (Heck if it works ... but anything's worth a try eh!?) .... how many biji u need?


Oh, and one last thing... Don't send your Jumban2 unit to Stereophile for review just yet, ok?
U.S. Customs might mistaken it for a parcel bomb or something....

Extraordinary comment.


Krell is the best of the best.

hughesths wrote:Extraordinary comment.


Krell is the best of the best.

How can ?? .... Jumban is the best of the bestest!

To attack and write such a hard condemnation of the preamp is harsh and crude by our fellow forumer. i think it would be worthwhile to encourage him to improve instead of putting him down.

Malaysian reviewers can be rather crude in writing, by putting up and coming manufactures down. Instead of using the phrase Milo can he could have put it as the plates used where soft and springy to the touch which cause some noise pickup. Not straight to the point but makes a nice read and does not sound so amateurish. Its bad enough locals do not support malaysian products

Wabun
Normally for the plates, i would suggest you look at least 1.2mm but 1.5mm would be better. Considering you are putting your tubes inside the preamp 1.5mm would help you to eliminate this effect. Also do note you are using the 6922 tube which is slightly microphonic. If the tubes are not too hot you could use some o-rings bought from the valve or hardware shops. Get the 200C version helps.
Also do consider keeping your sound character unique and not that much customizable. People buy your sound character and your units should have a family sound. If you have a different sound character for each of your units then there is no family sound. It would be hard in the beginning but in the long term every establish design has its own family sound. Audio is diversified not every one likes a Krell, Mac, Audio Research to some it is great and to some not so great. BUt there will be your followers of your sound if you establish it well. THe local scene manufactures i notice tend to move around with their flavors perhaps to score more customers in the short run but you would suffer in the long run

Hope this helps
Nicholas CHua
Promitheusaudio

promitheusaudio wrote:To attack and write such a hard condemnation of the preamp is harsh and crude by our fellow forumer. i think it would be worthwhile to encourage him to improvement instead of putting him down.

Ehhh.. .wabun and I got a thing going on here one .... don't spoil the fun between us lah.

Besides ... i sincerely offer to sponsor him a good Hakko soldering iron plus some ferrite cores already...
I don't see anyone else making such an offer here !

Wabun.....

You may have lost the battle but you have the WAR to win.

Take the negatives and turn them into positives. I believe sometimes a "Harsh" criticsm would get the adrenalin flowing in a person.

My 2 cents views;

Don't let your design be too simple, let it be simply basic which follows a common trail be it acoustically or cosmetically. From there you udate/ upgrade but keep that little "DOT" that everyone immediately can recognize your product. ( like most established products )

Possibility of you going back to the drawing board is high but it would be worth the venture for the long haul.

cheers.

"Bass was quite deep, but not as firm as when being driven by, say, the Krell’s own preamp section, but gave no cause for worry".

Now i'm wondering if the above is a characteristic of the Valve kind of bass or something else? In my second system comprising of 6SL7 pre/6v6 Power valve setup which feeds my subwoofer from the high level outputs of the valve amp, the resulting bass is not as firm as I would like. And prior to buying the Krell300i, when my Minima Amators were powered by 2 Cary EL34 valve monoblocks, the bass was deep but anything but firm.

So, those of you who use valve amplification, could you confirm if this type of bass is the characteristics of valve or not?

mugenfoo wrote:

hughesths wrote:Extraordinary comment.


Krell is the best of the best.

How can ?? .... Jumban is the best of the bestest!

No, only Krell rules.

Don't worry Wabun, at least your Pre amp was still qualified being reviewed by The Star Audiophile, it showed that your design is not completely worthless.
As I'm only an ordinary audiophile and not a hifi designer, I'm not qualified to comment the quality of your product. I however respect you for the courage and effort put to design a pre amp.
Lastly, nothing is perfect, so don't be upset. Cheers.

wabun, next time u in KL ... i take u go shopping for a good Hakko soldering iron at Jln Pasar... i sponsor you, a good model with temperature control. yes i mean it one.

And can go meet up Frankie Voon also (designer of Pipit phonos, DAC kits, numerous own designed Amps).


Now everyone else, don't say that I didn't support "local designer" here !




But at present ... I think it is not quite ready for "Stereophile ranking" just yet. But feel free to disagree here !

hughesths wrote:

mugenfoo wrote:

hughesths wrote:Extraordinary comment.


Krell is the best of the best.

How can ?? .... Jumban is the best of the bestest!

No, only Krell rules.

OK, Krell rules then ! Yay !

Actually ... U said it .. not me.

mugenfoo wrote:

hughesths wrote:

mugenfoo wrote:

hughesths wrote:Extraordinary comment.


Krell is the best of the best.

How can ?? .... Jumban is the best of the bestest!

No, only Krell rules.

OK, Krell rules then ! Yay !

hey Mugenfool,

How can u compare things that in different class??? Pls compare apple with apple lah..... If u r so good, then design your own preamp to compare with others.

Ops, sorry for spell your name wrongly, hope u don't mind....

noodle88 wrote:Ops, sorry for spell your name wrongly, hope u don't mind....

its ok noodle-ass, .. i'd only compare you to a monkey with half deaf ears anyway .... and the monkey wins over you anytime of the day. And the proof is in the CJ Premier11 example.

bassraptor wrote:

so stay cool

btw, it seems jumpan2 is making our friend wabun selling off his Sonic Frontiers Line 3 Preamp.. presumable to fund a new JumPan?

cheers,

zb

mugenfoo wrote:

noodle88 wrote:Ops, sorry for spell your name wrongly, hope u don't mind....

its ok noodle-ass, .. i'd only compare you to a monkey with half deaf ears anyway .... and the monkey wins over you anytime of the day. And the proof is in the CJ Premier11 example.

Hey, m I wrong? Only foo compare the rm 1200 preamp with 10-15 times of it's price. When r u going to built 1 to compare with others? U have none??? As a guru u have none of your own???? U just bought from others n u can become a guru?????

U might think the cj premier 11a sounded good or better than anyother amp. That's is your standard of interpretation. I wouldn't compare my 300b with the cj because the 300b amp is in much much higher ground n it's 10 time the price of the cj.

U r still young( in Hifi world ) if 1 day u get hold of a 15" full horn loaded u will know what u r listern to r just minicompo to us. So sorry to say that.

noodle88 wrote:

mugenfoo wrote:

noodle88 wrote:Ops, sorry for spell your name wrongly, hope u don't mind....

its ok noodle-ass, .. i'd only compare you to a monkey with half deaf ears anyway .... and the monkey wins over you anytime of the day. And the proof is in the CJ Premier11 example.

Hey, m I wrong? Only foo compare the rm 1200 preamp with 10-15 times of it's price. When r u going to built 1 to compare with others? U have none??? As a guru u have none of your own???? U just bought from others n u can become a guru?????

U might think the cj premier 11a sounded good or better than anyother amp. That's is your standard of interpretation. I wouldn't compare my 300b with the cj because the 300b amp is in much much higher ground n it's 10 time the price of the cj.

U r still young( in Hifi world ) if 1 day u get hold of a 15" full horn loaded u will know what u r listern to r just minicompo to us. So sorry to say that.

Stay cool noodle88, just say Krell is the best, in the world and the whole universe, aliens' reference equipments too.

What's the prize for winning in this argument har?? hahahahaha..

I sponsor 1 unit AWAI (Not Aiwa) mini compo. Got 1500 Watts and can play casette and 8 track.

car o scope wrote:What's the prize for winning in this argument har?? hahahahaha..

its ok ... noodleass can win this argument with his pussy-ass horns.
Nobody cares really. I'm just doing this to increase my post-count in this forum.

noodle, Here u go, u win ! U de champ !

bimmerman wrote:I sponsor 1 unit AWAI (Not Aiwa) mini compo. Got 1500 Watts and can play casette and 8 track.

Why not help sponsor our up-and-coming soon-to-be Super hifi designer wabun lah ....

I offer to sponsor a Hakko soldering iron already. Mebbe u can sponsor him some table vise-clamps or some silver solder ? Just a suggestion.

Noodle, enuff forum and posting craps... what can u offer & sponsor wabun to help him make Jumban3 which will "hope" to make it to Stereophile Class-A rating ???

Just a suggestion but instead of calling it Jumpan3, why not start afresh. How about Pan Labs Pandora?

..... ....

bassraptor wrote: ..... ....

Anyone here care to translate these hieroglyphs please?

I read the review again for the 3rd time today and perhaps the Jumpan2 is not that bad afterall. If the Jumpan2 picks up clicks and pops from light switches and fan regulators then how about considering a good AC Power conditioner? I'm sure it would help. The reviewer did recommend it and was thinking of getting one himself. Perhaps the review unit was an early prototype put together in haste and now that the flaws are pointed out, perhaps Wabun can make some corrections and address the shortcomings. Also, the reviewer did mention he heard 2 different units of Jumpan2 sounding different. Bass was said to be not as tight as the Krells own pre section but could this be the characteristics of the valve type of bass?

I've got a feeling you can pair the Jumpan2 with all it's valve warmness and rich midrange to budget powerhouses like say a NAD C272 or a pair of Audiolab 8000M and take on the valve giants from the likes of Audio Research or dare even I say McIntosh?

= studying
= bomb

Stay cool noodle88, just say Krell is the best, in the world and the whole universe, aliens' reference equipments too. [/quote]

How do you know Krell's aliens' reference equipments too?

hi frd argument no end .

hazy wrote:hi frd argument no end .

It's never an argument frd, just searching for the truth.

soonthas wrote:

hazy wrote:hi frd argument no end .

It's never an argument frd, just searching for the truth.

Who's arguing ? ... These are all "discussions" only.


I for one, NEVER claims anything to be the best. Yes, really, If anyone
can find one serious post from me here and quote me that I claim that "Krell is the best in the whole entire universe" or "McIntosh is the best in the whole entire universe" or " (fill in your brand here) is the best in the whole entire universe" ... Then mr. hifi4sale admin, please DELETE my account from this forum and i shall hold my peace forever and ever, amen.

I can go so far as to even lists down the shortcomings of a typical Krell setup. Yes, don't expect that lush seductive sweetness for vocal performances. Also don't go a looking for warm fuzzy tubey kind of sound in a Krell. But a total opposite instead. Mr. D'agostino didn't become famous from building lullaby machines.

The gist of it is, I'd love a Krell for all its strengths, yet its shortcomings don't bother me one bit. But i won't go so far to say Krell (or whatever brand) is the be-all end-all of all amplifiers.


Let see if mr. Horn speaker advocate here can swallow his own ego and lists the sonic shortfalls of high efficiency honky tonk horn speakers instead of claiming that compared to his "horns", everything else will sound like minicompo. BTW, this is coming from the same clown that sweepingy states "hi power = hi distortion" ya...

Man, Krell, McIntosh and Audio Research certainly get a lot of flak for being what they are!

Should I feel guilty or inappropriate for owning one or two of these components at different points in my hifi life?

Still, my favourite passive preamps - that I've used so far - were from McCormack and Promitheus Audio.

As for phono stages, from Frankie of Pipit and the cheaper one from Audio Image.




(sorry, it's my day for emoticons)

@Bassraptor ,

Which "cheaper" unit r u referring to from Audio Image ?

The cheaperest 2-box design from Audio Image is already almost double the current price of a Pipit2, unless u are referring to Frankie's latest "Pipit Reference" full sized unit with multi input and multi-curve? ... then this should also be put side-by-side with AudioImage's "RIAA" (becoz of those big red LEDs shown in front) phono stage with multi-curve selection also.

bassraptor wrote:Man, Krell, McIntosh and Audio Research certainly get a lot of flak for being what they are!

Should I feel guilty or inappropriate for owning one or two of these components at different points in my hifi life?

Still, my favourite passive preamps - that I've used so far - were from McCormack and Promitheus Audio.

As for phono stages, from Frankie of Pipit and the cheaper one from Audio Image.




(sorry, it's my day for emoticons)

soonthas wrote:

hughesths wrote:Stay cool noodle88, just say Krell is the best, in the world and the whole universe, aliens' reference equipments too.

How do you know Krell's aliens' reference equipments too?

Jedi told him!

actually if u read the review properly, the reviewer did not criticise the preamp that badly.

sure there were issues with build quality and susceptibility to dirty power supply, but the reviewer said he was "impressed".

so the designer should just improve on the build quality, use thicker metal sheets and improve the power supply section.

tycham wrote:

soonthas wrote:

hughesths wrote:Stay cool noodle88, just say Krell is the best, in the world and the whole universe, aliens' reference equipments too.

How do you know Krell's aliens' reference equipments too?

Jedi told him!

Do not underestimate the Power of the Dark Side of the Force !




Actually, some history of Krell. The founder did indeed get the name from an old 1950's science-fiction movie called "Forbidden Planet". The "Krell" were some kind of super powerful race of alien beings with supposedly unlimited power/energy.

sflam wrote:actually if u read the review properly, the reviewer did not criticise the preamp that badly.

sure there were issues with build quality and susceptibility to dirty power supply, but the reviewer said he was "impressed".

so the designer should just improve on the build quality, use thicker metal sheets and improve the power supply section.

I agreed what you said, the reviewer did get impressed by the sonic performance and tempted to get himself a unit, but the reviewer should not include the filmsy chassis statement described by a visitor, which this statement became a sarcastic weapon used in this subject.
Anyway I deeply respect Wabun in designing such a Pre amp, as we all know pre amp design needs lots of technical knowledges, time, study and courage, it's not an easy work. I salute you, Wabun.

You guys are a funny lot.

I need to learn a lot more here from decoding the 'emoticon (yikes... nearly typed emotiva) encrypted msg' and frantically flipping my dictionary to find those new 21st century wordings here. Cheaperest for one. Then, need to read between the lines too. ROTFLOL....

Jedi.... that reminds me of another forumer in lowyat.net and avsforum. Luckily, this thread is not abt subwoofer. Else.....it would be something like this. Try to read it and not laugh

http://www.avsforum.com/avs-vb/showthread.php?t=1210929

htkaki,
I think that 'mr.boom boom' used to ask the same question at lowyat.net forum.. "I want boom boom sound'..

terrible english and would not even consider any recommendations except for a certain speakers he listened to a shop which he likes the 'boom boom' sound..!

Wonder when he will drop by...

soonthas wrote:Stay cool noodle88, just say Krell is the best, in the world and the whole universe, aliens' reference equipments too.

How do you know Krell's aliens' reference equipments too?[/quote]


Former Paranormal FBI Agent Mulder and Agent Scully had ever confirmed that based on their investigations and findings of all the crashed extraterrestrial flying saucers in all over the world although highly confidential.

I been bombarded by his "Loud boomy boom boom. I listering to Tamil songs. Must tight bass and enough power shake house. Can your sub loud boomy boom boom? Sure are you?"

Here are some of his postings : http://forum.lowyat.net/topic/1264488/+60

Maybe we can get some guys to customise a sub for him to listering (and not listening)`

Mugen, yes, the two-box system. I tried the one with the various curves, but returned it and stayed with the cheaper unit.

I last used Frankie's Pipit in the 1990s ... since then, it's been difficult to track him down and commit him to get something done. But I just managed to get his number, so plan to hound him again.

im play more 10 year with krells . NO aleins or genies come share listen my stuff.

My manley monoblock easly walap my krell monoblock .
For me D agostino cant build once of mousqito .

just listen enought.

i wish i understood all of that. especially the mousqito bit ...

Is it the time of the day or the effects after reading mr.boom boom postings that the last posting has some alien 'influence'...

no offence hazi..

hazy wrote:im play more 10 year with krells . NO aleins or genies come share listen my stuff.

My manley monoblock easly walap my krell monoblock .
For me D agostino cant build once of mousqito .

just listen enought.

Hey hazy ... no problem ... got alot of brand also will walap krell one...

so , when u want to jual your krell lelong lelong , post in the FS section ya? I'll watch the FS section closely!
How about can start with that Ref 64 DAC ?

OK, so have you placed your order for one yet ?
It's alright, i don't need to know if u did.

Bet he'd sure be really happy you did. So go ahead, make his day.

hughesths wrote:
Anyway I deeply respect Wabun in designing such a Pre amp, as we all know pre amp design needs lots of technical knowledges, time, study and courage, it's not an easy work. I salute you, Wabun.

bassraptor wrote:Mugen, yes, the two-box system. I tried the one with the various curves, but returned it and stayed with the cheaper unit.

I last used Frankie's Pipit in the 1990s ... since then, it's been difficult to track him down and commit him to get something done. But I just managed to get his number, so plan to hound him again.

OK, that Audio Image "cheaper unit" still goes for more than what a Pipit2 would go for.
I think that Audio Image shoebox shaped 2 box unit goes for slightly over 2K now.

Recently brought a hifi kaki to buy one of Frankie boy's last units of pipit2, brand new for RM1K+.

Had a brief comparison between Pipit1 mk.2 A/B against the Pipit2. But in all fairness, the pipit2 was not run-in yet. Still it managed to show the strengths where Frankie boy had improved over the 1st Gen pipit. But all being said, that Pipit1 is still the seductress of vocal performances.