[rca2000]

I THINK...you are measuring BACKWARDS...Otherwise...you have NO plate voltage----and I do NOT think that would result in a no-brightness condition. but--maybe I am wrong.

let's asume you ARE measuring backwards..This makes more sense. THEN...you are getting 320 colts on the PLATE-----and that is likely WAY too high.

I see only - 8 volts on pin 3 (8). this sounds WAY too high to me....tube would NOT draw any current and WILL keen cathode of CRT cut-off.


HERE...accd. to Sams is what your voltages SHOULD be..on that tube.:

Pin 1--cathode--.5 volts

pin 2--control grid--- -2.5 volts..

pin 3-, pin 9--grounded.

pin 4, 5 --filamant.

pin 6-ground

pin 7--plate--235 volts. you are measuring WAY too much here.

pin 8--screen grid--115 volts. There is a 22K resistor here--r-70. CHeck to see if it is open or high in value.

Off of the grid pin--pin 2--there is a choke--l15--should read 10 ohms. Ths is paralleled by a resistor--R65, shoukd be 4.7K.

SOMETHING..is OPEN here.

ALSO..On the OTHER SIDE of L-15 is the delay line. COUld be open. if not...on the other sid eof it...is ANOTHER choke--L-12. 5.2 ohms. Then...it goes to a transsitor--Q5--the 2ND video amp, collector pin. SHould read 11.6 voilts or so. ,Base should read 16 volts, emitter 16.5 volts. lThis is a PNP transsitor---it relies on a differential i voltages on base to collector--toi conduct. base goes CONTRAST control--which is connected to 21 volt line.through R-61 18K.