RCA 630TS maiden voyage -- sploosh!

[John Folsom]

Phil,
Your symptioms of diminishing brightness with advancing brightness control sound like either inadequate high voltage, or low B+ to the HV section. Check the B+ at hte damper.
Try unpluging the high voltage capacitor, sometimes they can fail and overload the high voltage. Disconnect the CRT anode an measure the high voltage, then reconnect it and measure it as you advance the brightness.

Try replacing the damepr and hv rectifier tubes.

One of these things should lead you in the right deriction.

[rcaman]

replace that large resistor under the 1b3 tube. it looks as if it has been hot. if cracked it will arc. steve

[rcaman]

Originally Posted by rcaman

replace that large resistor under the 1b3 tube. it looks as if it has been hot. if cracked it will arc. steve

r253 i meg reolace that resistor

[Phil Nelson]

Originally Posted by rcaman

r253 i meg reolace that resistor

Thanks, that is on my to-do list. Also the second resistor in that photo. I might as well replace the little one, too, as long as I'm in there.

I don't have any 3.3 ohm resistors in the house, but perhaps a 3.0 ohm will do here.

If anyone votes for using a 4.7 ohm in place of a 3.0 ohm, speak now or forever hold your peace. That's all I've got on hand, and I don't feel like waiting 3 days to order one resistor thru the mail :-)

[wa2ise]

Originally Posted by Phil Nelson

Thanks, that is on my to-do list. Also the second resistor in that photo. I might as well replace the little one, too, as long as I'm in there.

I don't have any 3.3 ohm resistors in the house, but perhaps a 3.0 ohm will do here.

That will be close enough.

[Phil Nelson]

Wahoo! Replacing the bad 1 meg resistor cured the arcing.

Now, on to the next problem. Thx for the advice :-)