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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 8th May 2018, 12:36 AM   #21
mudiwater is offline mudiwater  United States
diyAudio Member
Join Date: Mar 2017
First, thanks to everyone for your input. After going over things a few times, I believe that my only real problem has been low sensitivity speakers. I had a friend bring over his Martin Logan bookshelf speakers that claim 92 dB sensitivity and a 6 ohm load. The SSE sounded outstanding through these speakers.

It sounds great with KT88's (400 ohm cathode resistors), RCA 12AT7, and 274b rectifier tube, in UL mode without feedback has been the best combo. It seems the 274b is not the ideal rectifier tube for this, but it sounds better than the GZ34's and 5U4's that i have?

I know this has been gone over and George has a nice chart laid out, but.............I am wanting to add a switchable cathode resistor to use EL34, 6L6 and KT88. The values I have landed on are 750 ohm (EL34), 510 ohm (6L6) and 360 ohm (KT88). I know these all fall in the chart George gave us, but from your experiences, what do you think? B+ 452 5k OPT

Thanks again
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