UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - 120W PP EL34 amplifier re-born.

Diabolical Artificer · 26th Sep 2018, 6:38 am

Thanks Al, some good idea's there. It is a puzzler, it's almost as if something is being transmitted back to the ECC83 triode gain stage or the LTP IP has gone very low Z, which I discounted as everything works from the LTP on.

It's a pain this, it should be coming together not falling apart, that said I'll find the fault and it's honing my fault finding skills. I start by wildly unplugging things, then actually start to reason. Ho hum.

Andy.

26th Sep 2018, 6:38 am	#9
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,657	Re: 120W PP EL34 amplifier re-born. Thanks Al, some good idea's there. It is a puzzler, it's almost as if something is being transmitted back to the ECC83 triode gain stage or the LTP IP has gone very low Z, which I discounted as everything works from the LTP on. It's a pain this, it should be coming together not falling apart, that said I'll find the fault and it's honing my fault finding skills. I start by wildly unplugging things, then actually start to reason. Ho hum. Andy. __________________ Curiosity hasn't killed this cat...so far.