Fleetie wrote:

Shoulda done that first. Or looked for a tube location chart
somewhere inside the radio.

No, there isn't one, and there are no markings on the PCB or stuck by
the valve bases.

Pity.


Well, I am pretty sure I have the valves in the right sockets
now. It's FAR more promising with the current line-up than it was with
any other permutation.

The valve pinouts could have helped, by giving you something to go on
regarding what sort of circuit should be connected to a given pin - a bit of
careful tracing between valve bases and power supplies / grounds can help
identify heaters, anodes and cathodes.


It could even be working, and there are no MW
or LW stations with enough signal round here, but I don't believe
that! I think it's not working.

I get the feeling that it would a pretty resilient set if it survived what
you described earlier. Got another MW radio that you can try out?


Plus I did find one pic on the net
that had the locations of two of the four valves marked, and that's
how I have it now, so that narrows things down.

Methinks the pinouts and some tracing would be a good idea.


I'm just not convinced that I haven't fried a passive component
or two.

If there was arcing in the valves, then they might be the worse for wear.
Damage to secondary components certainly can be ruled out.


No, I haven't fried a thing of beauty or value. 10 or 15 quid
seems to be about the going rate for them.

Keith might have been alluding to the rarity. All things are fixable,
however.


I paid 10 plus a
fiver postage. I think I have a valve supplier sorted, and they
seem to be less than 3 quid each, and I'm sure the audio output
valve is fine, so that's only 3 to replace, and I reckon only
one or two of them will actually need replacing.

Well, you said that you were getting noise from the speaker, so that
suggests that the o/p stage might okay.


I was a little disappointed to find it uses a PCB. I was hoping for
a chassis-based radio that I could kinda strip down to the chassis,
polish up, and have around as a cool valve radio curio that worked,
but the PCB kinda detracts from the look of the thing, really. But I'm
prepared to at least get a new set of valves and poke around some more
for dead-looking resistors.

I can understand the attraction of hard-wired valve circuits. I have a
couple of old guitar amps that don't use PCBs. I have an even older valve
radio that does.


We'll see what develops.

Indeed. Report back. :-)


--
Wally
www.makearatherlonglinkthattakesyounowhere.com
Things are always clearer in the cold, post-upload light.