[R-390] OT: Need advice regarding Blaupunkt tube radio

[Barry]

Sorry for OT, but I know there are folks on this list that will know this and I don't know who else to ask.

I have a 1962 Blaupunkt Verona (3-band - AM,FM,SW) with a classic 4-tube lineup for AM (5 for FM, and the 6th tube is the magic eye).  It works (sort of) on FM, but it is it deaf on AM and SW.  I've checked a lot of things and, so far, have not found anything obvious.  It will hear a very, very strong signal from the generator (on the order of 3mV) but nothing on the order of the sensitivity it should have.

I'm suspecting the first tube (the osciillator/mixer) as a possible problem.  It is oscillating nicely, but the grid bias for the oscillator is very low (on the order of about -1V instead of the -5V to -8V or so that it's supposed to have).

Referring to the following site for the tube (ECH81 / 6AJ8):

http://www.r-type.org/exhib/aaa0036.htm

It states the oscillator should be feeding the heptode mixer with "13 volts amplitude sine wave".  My question is: should that be 13V RMS?  I realize it isn't absolute or critical (values somewhat lower than 13V will still work), but I'm curious what it *should* be seeing.

I don't have it up and running with the scope at the present, but I *think* I'm seeing around 1 or 2 volts PtP and I think that's entirely too low.

I've inserted the 460kc IF signal and can peak the output transformer so I'm pretty sure the problem is at the oscillator/mixer stage or upstream from that.

Thanks guys,

Barry - N4BUQ