21-04-2011, 01:12 PM
I found a couple of resistors which were the right size to finish this off but looked a bit puny as regards power. I thought they'd at least do for a brief test and have just tried it.
I stepped up through various light-bulbs and finally connected it direct.
There was a bit of crackling but, glory of glories, NO HUM. There was no audio either.
There's a bit of noise when the volume is adjusted and prodding the connection with an (insulated!) screw-driver made a crackle so the audio stage seems to be working.
I'd like to know what the most obvious things to check are. Is there any safe way of injecting an external audio signal into it just to confirm that that part is working.
Actually this test has gone much better than I was expecting given the state of the components I've replaced.
As ever, many thanks.
- Joe
I stepped up through various light-bulbs and finally connected it direct.
There was a bit of crackling but, glory of glories, NO HUM. There was no audio either.
There's a bit of noise when the volume is adjusted and prodding the connection with an (insulated!) screw-driver made a crackle so the audio stage seems to be working.
I'd like to know what the most obvious things to check are. Is there any safe way of injecting an external audio signal into it just to confirm that that part is working.
Actually this test has gone much better than I was expecting given the state of the components I've replaced.
As ever, many thanks.
- Joe
