Jadis JA-200 Mk. II Amplifiers
- Thread starter Ron Resnick
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- jadis ja-200 mk. ii
Surely - but Solen capacitors are manufactured by SCR, the manufacturer of some capacitors used in Jadis equipment - see this JP80.
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Yes - but it doesn't mean they sound the same. Black Gates were manufactured by Rubycon - it doesn't make Rubycon caps as good as Black Gates.
So, I ran this by my local tech and also a local electrical engineering friend....
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And they both said the same thing........Excellent idea.
IF you want to risk doing serious damage to your amp
I seem unable to hear a difference between Solen and SCR teflons. The analogy with Blackgate is inappropriate: those were manufactured by Rubycon under license and used a completely different technology to anything Rubycon ever produced.
It is interesting if Jadis do not burn-in the caps before assembly. They might.
It is interesting if Jadis do not burn-in the caps before assembly. They might.
Probably. Most manufacturers include this general warning, but mainly because of input/driver or power supply sections, particularly if they have regulated sections.
Please consider that many times the amplifiers are operating "without" output tubes - when the B+ fuse blows. The amplifiers must be prepared for this condition.
As the cj's have a B+ fuse, I burned in the Teflon capacitors with the output tubes in place without fuse - no plate current, no tube wear!
ARC's do not have fuses, I had to take the output tubes out.BTW, some Jadis amplifiers have a standy/power switch - if it is the case just burn-in the coupling capacitors in standby!
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So, I ran this by my local tech and also a local electrical engineering friend....
::::::
:::::
And they both said the same thing........Excellent idea.
IF you want to risk doing serious damage to your amp
It would be great if they had explained what damage and why. Can you elucidate us?
I did not invent this idea, experienced people from DIY forums also use it and never reported any problem. The only problem I can think about is with poorly designed amplifiers that have power capacitors with unsafe voltage ratings - not the type of amplifiers I want to own. A power amplifier should not be seriously damaged if it has a fault in a power tube.
BTW Jadis power amplifiers have very simple circuits and high quality components.
The best I know about is Atma-sphere - Ralph Karsten used to pull the tubes of the amplifier while is was playing!
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Has anyone compared a Jadis amplifier with KT-120 or KT-150 output tubes to a Jadis amplifier with EL-34 output tubes?
I have heard a Jadis with EL 34’s in the past. If it wasn’t for the fact that the new models utilize the KT150’s, I probably would have gone for the model with EL34’s. However, IMO, the new KT150’s are far more wide band and resolving than the older EL’s. Biggest difference to me, and this was very quickly evident, was the major improvement at both ends of the frequency spectrum with the newer KT 150’s. I have not heard a Jadis amp with KT120’s, so cannot comment; except to say that I suspect it would probably be a step up over EL34’s also.
I am looking for a copy of VTL's owners manual for the MB750 Reference mono blocks. Anyone know where I can download it from? Thanks, Daniel
I think these have to be experienced, there is no point describing, which is what I said in my earlier post 6 years ago. I wish I did videos then.
The older ones were, like the JL2 Sig, but the newer ones I suspect are not. I have no experience with the latest models but found the JL2 and JL3 to be good sounding amps.
An amplifier can be push pull and class A at the same time.
Ex. almost all class A solid state amps.
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