zenith porthole question

[init4fun]

Originally Posted by stusnyder

checked the vertical output, vertical osc. and agc section. Did not find anything significant... But I did find a new problem. I decided to check voltages, and I started at the power supply. There are 3 tubes in the supply, a 5y3gt, 5u4g, and a 6bf5.
So here's what I found:

5y3gt pin 2 riders says 187 volts. I got 218 volts.
5u4g pin 2 riders - 382 volts. I got 415
6bf5 pin 6 riders - 97 volts. I got 137.

My line voltage is 116 volts. Anyone have any ideas?

Are you using a modern digital volt meter to take these measurements ?

If so , your readings look fine . If you have a good ol Simpson 260 or other such vintage meter around , I'll bet you find the readings will more closely resemble spec. Remember , our modern DVMs don't load the circuit they're measuring like the classic 260 would , and thus the higher readings .

PS , what did the schematic call out for Input voltage ?

If they listed 110 and your at 116 , that could also explain slightly higher readings ...