Stereo Driver PCB for PP Amp (EL34/KT88)?

Cobra2 · 22nd February 2007, 07:39 PM

Are there any good "universal" driver pcb (stereo) for a PP amp, that use octal-tubes?

I have only found this (mono) pcb;
http://euphoniaaudio.netfirms.com/ea...3f70011c917a56

Arne K

navin · 23rd February 2007, 04:35 AM

Quote:

Originally posted by Cobra2
Are there any good "universal" driver pcb (stereo) for a PP amp, that use octal-tubes?

I have only found this (mono) pcb;
http://euphoniaaudio.netfirms.com/ea...3f70011c917a56

Arne K

which octals can be used here? A stereo PCB would be great.

Cobra2 · 23rd February 2007, 07:05 AM

The "uniamp" :
http://www.pmillett.com/push-pull_kt...driver_pcb.htm

Arne K

lousymusician · 24th February 2007, 12:10 AM

This is a drop in board for the ST70 (EL34's) using octals. I've not used it, nor can I guarantee it would be happy with KT88's: Mapletree Audio

Geek · 27th February 2007, 09:03 AM

If you're looking for a general PCB for octals that you can design your own preamp/driver on, I have an experimenter's PCB that might be of interest.

Cobra2 · 27th February 2007, 11:11 AM

Thanx, parts already ordered some days ago... ;-)

Arne K

Geek · 27th February 2007, 11:24 AM

Quote:

Originally posted by Cobra2
Thanx, parts already ordered some days ago... ;-)

Arne K

*puts 2 and 2 together*

D'OH!

Small world!

Cobra2 · 27th February 2007, 11:30 AM

No problem...if they really are as practical as they look, I will come back for more ;-)

Arne K

roline · 17th December 2010, 09:50 PM

Just finished another PCB using the toner transfer method. This time a driver for KT88 amp, using Russian 6H6N LTP with CCS driven by 6SN7 first stage. The PCB is a little larger than the ST70 PCB to get the CCS heat sinks to fit. The amp was first designed around the old 7199 PCB to clone the ST70, but with all of the input on better tubes, it is evolving. Added balance to the bias to reduce dependence on having to buy perfectly matched pairs/quads, adjustable CCS on the LTP and gain adjustment on the input stage. The 6H6N tube was described as an excellent driver with neutral influence on the tonal quality. The 6SN7's have just been the opposite. Lots of tonal characteristic based on vintage and supplier. Sounds like fun to find the perfect tube to compliment the room characteristics..

I will try to work on it over the holidays after the elves get the compactron amp completed. I'l have to do another one for me , the current compactron is a stocking stuffer.

22nd February 2007, 07:39 PM	#1
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	Stereo Driver PCB for PP Amp (EL34/KT88)? Are there any good "universal" driver pcb (stereo) for a PP amp, that use octal-tubes? I have only found this (mono) pcb; http://euphoniaaudio.netfirms.com/ea...3f70011c917a56 Arne K __________________ Ars longa, vita brevis

23rd February 2007, 07:05 AM	#3
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	The "uniamp" : http://www.pmillett.com/push-pull_kt...driver_pcb.htm Arne K __________________ Ars longa, vita brevis

24th February 2007, 12:10 AM	#4
lousymusician diyAudio Member Join Date: Nov 2005 Location: NorCal	This is a drop in board for the ST70 (EL34's) using octals. I've not used it, nor can I guarantee it would be happy with KT88's: Mapletree Audio __________________ The difference between theory and practice is that in theory there is no difference between theory and practice, but in practice there is.

27th February 2007, 11:11 AM	#6
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	Thanx, parts already ordered some days ago... ;-) Arne K __________________ Ars longa, vita brevis

27th February 2007, 11:30 AM	#8
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	No problem...if they really are as practical as they look, I will come back for more ;-) Arne K __________________ Ars longa, vita brevis

27th February 2007, 09:03 AM	#5
Geek diyAudio Member Join Date: Sep 2004	If you're looking for a general PCB for octals that you can design your own preamp/driver on, I have an experimenter's PCB that might be of interest.

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