Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Rusty on November 03, 2019, 01:24:55 pm
-
Greetings,
My second post on the forum... So after introductions I figured I would post what I can't really claim I've built, more like boiled down from a full console Hi Fi chassis receiver to just a stereo amplifier.
Uses a pair of ECL86s (originally 6GW8s) and a voltage doubler off the power transformer's 100 VAC output to make about 2.5 W per channel. It's been my first foray into tube territory and I have ordered a quad of Chinese EL34s to build a push-pull unit with a bit more grunt.
I had no schematic to work with, so as I removed the RF tuner portion I would occasionally power the unit up to make sure it was still working. Lots of caps have been replaced but so far the electrolytics are still OK.
I have noticed that one of the cathode bypass resistors has aged and 'worn' from the 150 ohm markings to 170. I removed the tone controls and put in a newer volume pot and knob. It's not boutique, but I like it.
Anyway as I acquire more for the EL34 build I will post my ideas and questions and see what gives.
-
cool. Do you plan to draw up a final schematic? I.m quite cursious .
grtz
-
cool. Do you plan to draw up a final schematic? I.m quite cursious .
grtz
I have not scratched out a schematic for the ECL86 chassis, but I should. I will post it here. If you refer to the EL34 p/p amp, well that is just ideas in my head so far...