19-10-2023, 10:27 PM
Yes, thanks for invitation to Hemswell, I look forward to a visit. The BD272's were coming into use at Skelton while I was there. Anybody remember the SWB18's with the trolley coil assemblies being sweatily changed over at 3 a.m?
Anyway regarding the Hacker RP25, it's hard for me to say this, but it was one of the"new" PP9's. Although showing good voltage at low load it couldn't deliver the current for high output level. On Long Wave I suspect the local oscillator was cutting out as the load came on, producing a kind of motorboating effect? Never buy an apparently new shrink wrapped PP9 if the date stamp isn't clear!
I'd thought about it, had a fortunate guess, and a local "thaw" enabled me to change the batteries again and now peace is restored.
Don't know whether I'll tart up the intended donor RP25 and offload it or keep it for spares. Let me know if anybody needs some parts?
Anyway regarding the Hacker RP25, it's hard for me to say this, but it was one of the"new" PP9's. Although showing good voltage at low load it couldn't deliver the current for high output level. On Long Wave I suspect the local oscillator was cutting out as the load came on, producing a kind of motorboating effect? Never buy an apparently new shrink wrapped PP9 if the date stamp isn't clear!
I'd thought about it, had a fortunate guess, and a local "thaw" enabled me to change the batteries again and now peace is restored.
Don't know whether I'll tart up the intended donor RP25 and offload it or keep it for spares. Let me know if anybody needs some parts?
