[Penthode]

It was six years ago in June 2020 I restored this set.

To recap, I intended to make this a thoughtful restoration. That is I only replaced what was absolutely necessary. I would only replace what I felt necessary to affect the operation of the set.

I attempted first to reform all the electrolytics. Amazingly all the chassis mount can electrolytics reformed well with minimal expected leakage. An axial tubular 40uF.electrolytic used as the audio output screen decoupling capacitor was bad and replaced by a modern unit.

I next used my transconductance tube tester to check and replace weak and defective tubes.

Analysing the circuit, I next only replaced the paper capacitors that were not shunted by a low resistance. In other words, if the capacitor was in a high impedance circuit or there was a high dc voltage normally across it, the capacitor was replaced.

Lastly, resistors were only replaced if they caused impairment to the sets operation. After the capacitors were dealt with and when the set was powered, I would look for any obivious operation faults which would point to a bad resistor. Then even if there was no apparent fault, I would measure and compare the voltages recorded in the RCA service notes.

In the past six years, I expect it has operated for about 2000 hours. The only issue I have had was a worn 1/4" brass fine tuning shaft. the excessive play made it difficult to fine tune. Recall this is a split sound non-intercarrier set and tuning for best sound was difficult. The solution was replacing the brass shaft on the KRK 2 tuner variable capacitor. That was two years ago and it remains excellent since the fix.

Here are a couple of snapshots from tonight's Saturday Night Live.