18-04-2011, 05:13 PM
I've been playing this radio a lot in recent days and it's sounded terrific despite still having 9V on pin 2 of the EL84.
I got the final parts I wanted for it on today's post and got them fitted. This means that C31, C39, C43, C44, C45, C46, C49, R20 and R22 have been re-newed (R19 was bang on so hasn't been). That stray DC is still there but I wasn't bothered as it was working well beyond my satisfaction so I put it back together properly.
[attachment=790]
When I switched it back on it sounded blinking awful, worse than at any time since I started work on it. It sounded more like something vibrating so out came the chassis again but I couldn't see anything and it still sounded lousy.
I then spent an hour or so checking that nothing was shorting and that there were no dry joints.
I still thought it sounded more mechanical than electrical so tried another speaker and it played fine through that. The original sounds ropey when connected to a tranny so what's gone wrong with that I don't know. While working on the set I had a long lead connected to it and all I did today was solder the original wires back. I've never damaged a speaker before by soldering and would like to know just what I have done so I don't do it again.
I'd also like to thank everybody for their help, especially those who have gone above and beyond the call of duty. It would be invidious to name names but you know who you are.
All the best
Joe
I got the final parts I wanted for it on today's post and got them fitted. This means that C31, C39, C43, C44, C45, C46, C49, R20 and R22 have been re-newed (R19 was bang on so hasn't been). That stray DC is still there but I wasn't bothered as it was working well beyond my satisfaction so I put it back together properly.
[attachment=790]
When I switched it back on it sounded blinking awful, worse than at any time since I started work on it. It sounded more like something vibrating so out came the chassis again but I couldn't see anything and it still sounded lousy.
I then spent an hour or so checking that nothing was shorting and that there were no dry joints.
I still thought it sounded more mechanical than electrical so tried another speaker and it played fine through that. The original sounds ropey when connected to a tranny so what's gone wrong with that I don't know. While working on the set I had a long lead connected to it and all I did today was solder the original wires back. I've never damaged a speaker before by soldering and would like to know just what I have done so I don't do it again.
I'd also like to thank everybody for their help, especially those who have gone above and beyond the call of duty. It would be invidious to name names but you know who you are.
All the best
Joe
