UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Mike Phelan · 9th Sep 2011, 8:51 am

Col

If the 30P4 (or 30P19) and U191 are cold, the screen feed resistor on the 30P? might be OC. Scratch its top cap with an insulated screwdriver - if no trace of a spark, the line OP stage isn't running so it's safe to see if there's HT on the two top caps.
If not, then it might be an error in the wiring on the replaced LOPTx.

Don't worry about the U25 as it won't be doing anything at all at the moment.

I'm assuming that there is HT present and you have sufficient mains input re Jeffrey's post.

I won't see your replies for a few days as you'll know.

9th Sep 2011, 8:51 am	#57
Mike Phelan Dekatron Join Date: Nov 2003 Location: Near Leeds, West Yorkshire, UK Posts: 4,609	Re: Restorers dream part 2 the chassis. Col If the 30P4 (or 30P19) and U191 are cold, the screen feed resistor on the 30P? might be OC. Scratch its top cap with an insulated screwdriver - if no trace of a spark, the line OP stage isn't running so it's safe to see if there's HT on the two top caps. If not, then it might be an error in the wiring on the replaced LOPTx. Don't worry about the U25 as it won't be doing anything at all at the moment. I'm assuming that there is HT present and you have sufficient mains input re Jeffrey's post. I won't see your replies for a few days as you'll know. __________________ Mike.