how about "orphean" (melodious !)
Quite like that name. Perhaps I'll leave it to my Son to give the amp a name. After all after I've had my fun with it it will be his to keep. That is if he can prise it away from me!
Well last night with the help of NickG we managed to get music out of the power amp side using the volume control on my CD player. I was well impressed for the short time we had it running.
All didn't start off well though as on first fire up we blew the 1A fuse in spectacular fashion.
It completely shattered the whole fuse to mirco bits of glass. It turned out I had the primary connections on the power TX wired up wrong to the mains switch
Now in my defensive here I did query the primary winding pin outs with our venerable host as AE had not marked the tapping figures on the TX. From the resistance readings I obtained it was suggested the following:
Pin 4 - 0V
Pin 3 - 220V
Pin 2 - 230V
Pin 1 - 240V
So armed with this I connected the mains switch to pins 4 and 2!
However on further checking last night by Nick it turned out the actual pin outs are:
Pin 4 - 240V
Pin 3 - 230V
Pin 2 - 220V
Pin 1 - 0V
So a quick wire change over to pins 1 and 3 soon had this sorted
So with valves a glowing Nick was getting some strange voltage readings. I'd cocked something else up.
Turned out I missed a earth link wire between caps on the power supply.
Well I never confessed I knew what I was doing!! Still it was easily fixed.
So now we had all voltages around the values they should be and Nick suggested we see if it makes music as a stand alone power amp.
Indeed it did but as the hour was getting late we only played one track from 'Rising Sand' CD through the MLTLs. I don't think lack of loudness and punch from this little beastie is going to be a problem
So armed with a set of sketches and instructions that Nick has left me last night I hope today to get the preamp side of things wired up, ready for Nick to come over again and re-check my efforts and sort any hum/earth issues if we have any.
So today I'm a happy bunny.