Here is it! I pulled the knobs off right away to start cleaning them. The brass looks great and I can't wait to get 'er all shined up! Heavy as heck, too!!
I've had these tube socket inserts that I got off eBay (NOS, 20 for $8 shipped) and they look like they should fit; what do you guys all think?
Thanks Blast, I've got some bridges kicking around that I'll use in that case. I've read that silicon diodes are more efficient than selenium ones, and when they're switched that diodes have to be added to cut off the higher voltages. I don't need to worry about that?
Thanks for the photos! Don't worry about cosmetics or the socket inserts, for the time being.
Take the faceplate off and store it somewhere so it doesn't get beat up as you work on it.
First, with all the tubes out carefully check your AC voltages coming from the power transformer. You should have a pair of 360 volt taps at either pin 4 or pin 6 of the 5AR4 referenced to the grounded frame, a 50 volt tap (on the selenium bridge), a 6.3 volt tap for filaments and a 5 volt tap for 5AR4 filament.
Got all those? Then your PT is probably good.
Next, replace the bridge. Anything over 1 amp, 100 volts is fine. Remember to ground the positive output of the bridge.
Then replace the multi-stage 75/75/75/75uF (positive grounded) can with individual (100uF/100v) caps. Your can may be ok but, personally? I would replace it. I'm not a fan of 40 year old capacitors. Bend all the legs over on the original can to get them out of the way. Don't forget the bias voltage is negative. So you must ground the POSITIVE leads of all 4 caps.
Here's mine. Make your bridge look neater than mine by trimming the leads and use shrink wrap insulation:
Those 4 resistors are all 20 ohm 1 watt. I would suggest 2 watt. The one-watters get kinda hot.
You said something about adding a diode? No, I think you mean an additional, or higher resistance resistor. There are several opinions on this. You could replace the very first resistor with a 33 ohm 5 watt... Since the new bridge runs more efficiently the 33 ohm will lower the voltage a bit more. But a higher bias voltage (which is why I suggest 4x 20 ohm resistors) is actually a little "safer" on the output tubes. Your call. You can always 'tweak to taste' later.
So you need your bridge, 4 caps and 4 resistors. Start there and we'll move on with power supply cap replacements, ok?
Brian