Packard Bell Roundie

[DaveWM]

this one started out well, just a bad doubler cap, (a previous repair included a new doubler cap that was also bad) a couple weak/shorted tube. Raster comes up and tuner works (audio and no sync video).

Sync sep tube and AGC were the 1st things checked, no joy. scoping around proved the sync pulses were full of video noise (both horz and vert sync not good).

The problem ended up being twofold, an open plate load resistor in the sync separater tube, AND a badly drifted resistor that couples a horz pulse the the noise inverter tube from the focus coil.

Built like a zenith, all tube, no PCB's, but uses the 6Gu7s in the chroma board like an RCA and a 12AZ7 for the demodulator. Also uses a 6Bk4 shunt tube, which I like more than the Zenith pulse type 6HS5's (I seem to have more trouble with those than the shunt tubes).

It also uses a focus tube and not a Se stick

Anyway working very well, but still has a bit of noise in the pic, I tried a new RF amp and osc tube, as well as cleaning the tuner. its not bad, but its there.

Sometimes I wonder if is just my crappy cables, or maybe a bad balun. would be nice if I could just bypass that and go directly to the tuner with a 75 ohm coax.