What tube or tubes would make the biggest change in sound on this amp. The GZ-34, 7199's or the EL-34's. This amp is a Dynaco ST-70 rebuilt by Will Vincent. Also what would i gain or lose by using KT-77's instead of the EL-34's? Thanks, Tommy
If you purchase your output tubes from Kevin Deal: you'll never have to worry about getting "stuck", in ANY sense of the word. He's first class, all the way: (http://www.upscaleaudio.com/view_category.asp?cat=86)
Thanks for the link Rodman, he has alot to choose from. I just ordered a quad of the winged c Svetlana el34's. I'll post once they arrive and i have a chance to listen to them. Thanks guys.
I got a pair of RCA 7199's from my local dealer yesterday. All i can say is WOW. It's like a whole new amp. Alot more detail, but still sounds smooth. Now i really can't wait for the new EL-34's to arrive.
I would heed the advice of Stonedeaf....The 7199 is a medium mu triode / sharp cutoff pentode that is very prone to capacitance problems when it ages causing hum and premature clipping on one side of the waveform. That is, asymmetrical clipping and increased distortion. If you are into soldering I also would recommend replacing the mother board with and update that allows for 2 front end tubes instead of one per channel as the 7199/6AN8 was really not up to the task of properly driving the EL34 or the 6550 to clipping @ low distortion. G
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