Pilot tv crt

[timmy]

Well this pilot has issues first no sound but the original field coil speaker was replaced with a permanent magnet speaker that was hooked up and must have worked the voice coil was disconnected and those connections went to the new speaker via the field coil but just have a very low hum. The crt lights but I cannot get a hv reading maybe the probe area for the ground is not ground but rather some place else I don't know. 1b3 tests good it's new but I need to know where to put the ground from the hv probe so I can adjust the feedback ring to set the hv but the ring up or down I get nothing but there is hv. All the rest of the tubes test as new. First turn on it has a pic and after warm up the screen is unstable in different ways maybe that cause along with the hv could be the caps that were put in were ceramic disc where it don't call for those types but nevertheless the set must have worked and this whole set was recapped and they look new and the job that was done was extremely neat and clean better then factory. So if anyone knows these pilot 37 sets I would be open to a few hints, thanks.

[reichsrundfu]

Originally Posted by timmy

Well this pilot has issues first no sound but the original field coil speaker was replaced with a permanent magnet speaker that was hooked up and must have worked the voice coil was disconnected and those connections went to the new speaker via the field coil but just have a very low hum. The crt lights but I cannot get a hv reading maybe the probe area for the ground is not ground but rather some place else I don't know. 1b3 tests good it's new but I need to know where to put the ground from the hv probe so I can adjust the feedback ring to set the hv but the ring up or down I get nothing but there is hv. All the rest of the tubes test as new. First turn on it has a pic and after warm up the screen is unstable in different ways maybe that cause along with the hv could be the caps that were put in were ceramic disc where it don't call for those types but nevertheless the set must have worked and this whole set was recapped and they look new and the job that was done was extremely neat and clean better then factory. So if anyone knows these pilot 37 sets I would be open to a few hints, thanks.

Tim, have you completely recapped the chassis? Also I agree that you need to install some effective method of leveling out the initial surge current to the CRT. There are a couple ways to do it, and you'll really thank yourself later!

Re the audio: seems to be an interruption of the af after takeoff, evidence by the slight hum you're experiencing. So start by making certain you've replaced all paper caps before proceeding. I'm presuming you are getting a video signal to the CRT right now???

Remember, the Pilot TV37 is the Smart Car of early television. Don't expect quality-anywhere-and proceed accordingly. Once you get it working correctly you'll have actually good audio, and a decent picture if viewed thru a magnifying glass and a Scotch (or two) handy.

George

[timmy]

Originally Posted by reichsrundfu

Tim, have you completely recapped the chassis? Also I agree that you need to install some effective method of leveling out the initial surge current to the CRT. There are a couple ways to do it, and you'll really thank yourself later!

Re the audio: seems to be an interruption of the af after takeoff, evidence by the slight hum you're experiencing. So start by making certain you've replaced all paper caps before proceeding. I'm presuming you are getting a video signal to the CRT right now???

Remember, the Pilot TV37 is the Smart Car of early television. Don't expect quality-anywhere-and proceed accordingly. Once you get it working correctly you'll have actually good audio, and a decent picture if viewed thru a magnifying glass and a Scotch (or two) handy.

George

hey George yes it's been completely recapped including resistors and I got the audio working I figured it out and I have a perfect picture but what I'm left will is the vert size is maxed and won't fill the bottom half inch of the screen but 3 caps were put in that are nos, big mistake because they test good but sometimes under load they may change value so that's next for me to check. I get the reason for inrush protection because of the crt heater but this one the heater don't come on fast upon turn on so maybe something was put in already to protect it I don't know I didn't check it. Do you know the voltage or info on what zener to use to protect the heater, and does this Zener go across the heater feed wires. This zener is the glass diode IIRC .