Uses for Quicksilver Transformers

wrenchone · 31st October 2010, 10:07 PM

I just snagged a pair of new Quicksilver single-ended transformers on E-pay. They look as though they were intended for use with the Quicksilver SET Mono amp,9W/channel, using a KT88 and 6H30 tube complement. Since the transformer impedance is 3.3k, I suspect that the KT88 was used in triode mode. Anyway, I have no intention of just trying to copy whatever Quicksilver did, but want to go my own way. I am open to some suggestions as food for thought, as it'll be a while before I get around to wrapping an amp around this iron. How would you use these?

aardvarkash10 · 31st October 2010, 10:56 PM

I would package them safely and send them to New Zealand - a suitable forwarding address is available to you by PM at no cost!

wrenchone · 31st October 2010, 11:50 PM

Ho, Ho, Ho - dream on...

aardvarkash10 · 1st November 2010, 12:02 AM

aieeee, the waste! Well, they sound like a sitter for a cool parafeed or choke loaded effort with heaps of big iron mounted on the top...

DualTriode · 1st November 2010, 01:51 AM

Quote:

Originally Posted by wrenchone

I just snagged a pair of new Quicksilver single-ended transformers on E-pay. They look as though they were intended for use with the Quicksilver SET Mono amp,9W/channel, using a KT88 and 6H30 tube complement. Since the transformer impedance is 3.3k, I suspect that the KT88 was used in triode mode. Anyway, I have no intention of just trying to copy whatever Quicksilver did, but want to go my own way. I am open to some suggestions as food for thought, as it'll be a while before I get around to wrapping an amp around this iron. How would you use these?

Hello Wrenchone.
Do the transformers have UL taps?
What idle current will they use?
DT
All just for fun!

tinitus · 1st November 2010, 02:12 AM

btw, SET means "single ended triode"

I guess a DHT design would work ok, or?

wrenchone · 1st November 2010, 02:13 AM

No UL tap, and they are supposedly good for 120mA or so. One notion I had was to use a triode-connected 6550 or super 6BG6GA and a pentode front end, with Schade-style partial feedback to lower the output impedance of the output triode even more. This approach would be suited for the transformer impedance/turns ratio.

tubelab.com · 1st November 2010, 02:29 AM

Lets see here. Well the first thought is a KT88 cranked to about 100 mA in triode. But that would be too much like "copying what Quicksilver did." I call that a Simple SE and it is an amp worth building, but far closer to mainstream than unusual. You don't strike me as a 300B kind of person, but I had to toss that out there, been there done that, even like it. Maybe a big fat sweep tube in Schaded pentode, but haven't you done that one already? Could do it again with a bigger tube (35LR6).

Do the OPT's have multiple secondary taps to allow 6K operation? I assume that they are gapped for DC current. That would make it a waste to use them for something like a circlotron.

What about something totally different. Maybe a DHP with a dose of Schade?

tinitus · 1st November 2010, 02:57 AM

how about PSE(SEP?) with 2x EL84 ?

Wavebourn · 1st November 2010, 03:02 AM

I know you did not try yet GU-50 in triode mode.

I could bring a signed selected pair to BAF if knew about your transformers.

31st October 2010, 10:07 PM	#1
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	Uses for Quicksilver Transformers I just snagged a pair of new Quicksilver single-ended transformers on E-pay. They look as though they were intended for use with the Quicksilver SET Mono amp,9W/channel, using a KT88 and 6H30 tube complement. Since the transformer impedance is 3.3k, I suspect that the KT88 was used in triode mode. Anyway, I have no intention of just trying to copy whatever Quicksilver did, but want to go my own way. I am open to some suggestions as food for thought, as it'll be a while before I get around to wrapping an amp around this iron. How would you use these?

31st October 2010, 10:56 PM	#2
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	I would package them safely and send them to New Zealand - a suitable forwarding address is available to you by PM at no cost! __________________ Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012

1st November 2010, 12:02 AM	#4
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	aieeee, the waste! Well, they sound like a sitter for a cool parafeed or choke loaded effort with heaps of big iron mounted on the top... __________________ Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012

1st November 2010, 02:29 AM	#8
tubelab.com diyAudio Member Join Date: Jul 2005 Location: South Florida	Lets see here. Well the first thought is a KT88 cranked to about 100 mA in triode. But that would be too much like "copying what Quicksilver did." I call that a Simple SE and it is an amp worth building, but far closer to mainstream than unusual. You don't strike me as a 300B kind of person, but I had to toss that out there, been there done that, even like it. Maybe a big fat sweep tube in Schaded pentode, but haven't you done that one already? Could do it again with a bigger tube (35LR6). Do the OPT's have multiple secondary taps to allow 6K operation? I assume that they are gapped for DC current. That would make it a waste to use them for something like a circlotron. What about something totally different. Maybe a DHP with a dose of Schade? __________________ Too much power is almost enough! Turn it up till it explodes - then back up just a little.

1st November 2010, 03:02 AM	#10
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	I know you did not try yet GU-50 in triode mode. I could bring a signed selected pair to BAF if knew about your transformers. __________________ The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity!

31st October 2010, 11:50 PM	#3
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	Ho, Ho, Ho - dream on...

1st November 2010, 02:12 AM	#6
tinitus diyAudio Moderator Join Date: Nov 2005	btw, SET means "single ended triode" I guess a DHT design would work ok, or?

1st November 2010, 02:13 AM	#7
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	No UL tap, and they are supposedly good for 120mA or so. One notion I had was to use a triode-connected 6550 or super 6BG6GA and a pentode front end, with Schade-style partial feedback to lower the output impedance of the output triode even more. This approach would be suited for the transformer impedance/turns ratio.

1st November 2010, 02:57 AM	#9
tinitus diyAudio Moderator Join Date: Nov 2005	how about PSE(SEP?) with 2x EL84 ?

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