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/e...d=100&osCsid=16026765070727847c3f70011c917a56
Arne K
I have only found this (mono) pcb;
http://euphoniaaudio.netfirms.com/e...d=100&osCsid=16026765070727847c3f70011c917a56
Arne K
The "uniamp" :
http://www.pmillett.com/push-pull_kt88_class_a_amp_with_universal_driver_pcb.htm
Arne K
http://www.pmillett.com/push-pull_kt88_class_a_amp_with_universal_driver_pcb.htm
Arne K
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
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.
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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