Rca 721tcs

[N2IXK]

Back at it for a bit this afternoon. Ran The B+ up slowly again, while monitoring the +225 and -85 rails. Everything came up nicely, with no drama from the new caps. Brought a screwdriver near the focus coil, and the magnetic field seemed nice and strong.

Installed the 5V4 damper, and hung a voltmeter from the 6BG6 plate lead to ground. Fired the set up, and got about 260VDC at the plate cap. Quick check at the 6BG6 socket showed reasonable looking DC voltages on cathode, grid, and screen pins, and hooking a scope to the grid pin revealed a nice looking 30Vpp sawtooth drive signal!

Installed a 6BG6, shut off the bench lights, and applied power. Heard the horizontal come up, and bringing a neon bulb near the plate cap gave a dim glow., and a much brighter glow near the 1B3 plate lead. No signs of redplating or smoke, and flyback seems to be staying cool. So far, so good...

Installed a 1B3, and hooked my HV probe to the anode lead. Set is making about 4.9 kV. Low, but somewhat encouraging.

No sound from the speaker other than some crackling from a dirty volume control. Rotating the tuner gives no sound at all.

May try installing a CRT into the chassis tomorrow, to see if I get anything at all on the screen. Have to cut a foam block or something to hold the front of the tube up while testing. The it's on to the rest of the recapping work...