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Old 22nd February 2007, 07:39 PM   #1
Cobra2 is offline Cobra2  Norway
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Default 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
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Old 23rd February 2007, 04:35 AM   #2
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Default Re: Stereo Driver PCB for PP Amp (EL34/KT88)?

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.
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Old 23rd February 2007, 07:05 AM   #3
Cobra2 is offline Cobra2  Norway
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The "uniamp" :
http://www.pmillett.com/push-pull_kt...driver_pcb.htm

Arne K
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Old 24th February 2007, 12:10 AM   #4
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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
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Old 27th February 2007, 09:03 AM   #5
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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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Old 27th February 2007, 11:11 AM   #6
Cobra2 is offline Cobra2  Norway
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Thanx, parts already ordered some days ago... ;-)

Arne K
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Old 27th February 2007, 11:24 AM   #7
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Quote:
Originally posted by Cobra2
Thanx, parts already ordered some days ago... ;-)

Arne K
*puts 2 and 2 together*

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Old 27th February 2007, 11:30 AM   #8
Cobra2 is offline Cobra2  Norway
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No problem...if they really are as practical as they look, I will come back for more ;-)

Arne K
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Old 17th December 2010, 09:50 PM   #9
roline is offline roline  United States
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Default Just another KT88 Driver PCB, similar size to ST70

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.
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