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In Reply to: Re: Modern Caps,Vintage gear posted by tc on March 26, 2001 at 19:40:48:
Hi tc,
Yes,I`d recommend the 6PSP for Fisher.I have a good number of Fisher poweramps as does a good friend of mine,so I always have the opportunity to compare the differences between caps.BTW,I try to collect units with close serial number groupings when making listening judgements in regard to a type of cap that works the best for me,sonically.Currently,I`m comparing Model 200 monoblocks.One pair is using Illinois caps,the other is using 6PSP.We`ll see what happens after a few months of burn in.I`ll say less about Fisher recievers,only because I`ve never been crazy about 7591 based amps in general.6PSP seem to work out well in the earlier EL84 type integrateds though.
I like 6PSP because they`re fast,but not lean.Most of all they don`t tend to smear the focus in the mid bass/lower midrange the way many film types seem to do.This other group of caps includes the Sprauge 715P series.Many film caps give vintage gear a somewhat vauge midband with tinkly highs,but not the 6PSP in my experience. But,most people either don`t practice,or believe in,patiently burning in parts after a rebuild.Ya gotta give it time.If you rebuild,plug the unit in with a load,and let it burn for about 50 hours on and off before you listen for the first time.I do this so that I don`t unduly prejudice myself against a change.After about 200 hours,the parts start to settle into a place they will stay,sonically.Then one can make judjments about the personal sonic value of that part in that application.Good Luck scrooie looie
Follow Ups:
Hi Scrooie,
Your advice is very much appreciated and I will look into that. I do have some more costly Jensen oil caps of same specs (fro Fisher) but haven't managed to give them a try. I'll need to learn the basic techniques first. BTW, how come I haven't heard much talk about those modern oil caps in vintage gears, regardless the cost? Are they inferior in such applications? Just wondering...
Thanks again, tc
Hi tc,
While I`ve tried the majority of film caps out there,my oil cap experience has been limited to various Vitamin Qs for small signal applications in pushpull amps.They have`nt worked out for me.So,I can`t speak intelligently about other modern types.On the other hand SETs seem to react quite differently to oil caps in the signal path,but that`s a different forum.
Soon I`ll be trying some Ampohm oil caps in my vintage gear,mainly due to their higher impedance.They may behave in a way that is similar to the original types found in many vintage amps.We`ll see/listen.
Good luck scrooie looie
Yes, please share your listening impression here (or in email) once that's done, I'll be interested in trying that. Where can I acquire these Ampohm oil caps?
tc
Ampohm site-http://www4.topnet.it/vintagehifi/ampohm.htm
Hi scrooie,
Do you mind if I send you an email, instead of posting my naive questions here? Thanks.
tc
(nt)
Louie,
I set the bias on my amps using a 2w 16ohm resistor across each speaker + and -,with the taps on the 16ohm terminal,volume all the way down.Does this constitute a sufficient load to safely run an amp to break in caps?
Pat
Pat,
A 2w resistor is fine as long as your sure not to drive a signal into the amp,but it would`nt hurt to get 2 8ohm@20w resistors from Radio Shack,put them in series,then connect them to the output of the amp.It`s also a good idea to underfuse the unit during this static burn period,just in case an output tube goes cherry on you.Honestly, in 20 years of doing amp shootouts,I,or anyone I`ve known,have never loaded an amp for warm up,and nothing has ever gone wrong,ever.But still,I won`t recommend that to you,`cause if I do,your amp will probably go down and fire lightning bolts through your family pet!So please,load your amp like the good book says! Good Luck scrooie looie
Hi,
Ditto on the break-in period on caps.One of my 299B's is absolutely stock and must have very low time,based on condition(original Tele 12ax7,Scott 6bl8,RCA 7189,all test very good).Great reference for comparison,it has the original Cericaps.
I haven't tried the Sprague caps,but so far,the Xichons seems closest to stock.Light on the top,solid mids,muddy bass.As Joe Rosen likes to describe Scott,zzzzzzzzzZZZZZZZZZZZzzzzzzzzzz!The Auricaps speed everything up without thinning out the mids.Much better detail,with better clarity.
I tried the Illinois caps in this amp as part of a rebuild(VTV kit),and was underwhelmed.Less articulate than stock,thin midrange.I left it that way for about 6 months,and it never really opened up.
I'm doing a light re-do on an Eico HF81 I just bought,and will try the Sprague caps.I'll keep you posted.
Best,
Pat
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