Brought this on myself, spotted it at a Paddy's market, cabinet looked good. Decided that a collector mate would love it and brought it home.

I now have the chassis he has the rest. Someone has done a "serviceman" repair on it. In the interest of its welfare that needs doing properly.

AORSM seems to not have a specific circuit for it, filter caps look wrong, dodgy rubber wire some which has been replaced with plastic wire that looks ghastly.

Sales dept said it did not run which at first made me cringe, however the 80 is missing so that would limit the damage if it was powered without it.

If any one could help with the specific schematic, it would be appreciated.

Dual wave with 6J8, 6U7, 75, 6V6 rectifier 80. Speaker Electrodynamic.

Marc

I can't find any set with that specific line-up, but a 6B6G instead of a 75 yields these Astors:

Model, chassis, type
354,CLM, AC DW Mantel
554, BL, AC BC Console
654, CLC, AC DW Console

However, a 6B6 is hardly a substitute for a 75!

Radiomuseum shows 6J8G 6U7G 6B6G 6V6G 5Y3G (and a schematic) for "Astor KJ 1946/1947", and from the bit of the parts list that I'm able to see it says "dynamic speaker, 1500 ohm field" so I'm not sure what's going on. Did this model name run for some years and a have variety of chassis designs?

That schematic also appears to be the one available from Kevin Chant:

http://www.kevinchant.com/uploads/7/1/0/8/7108231/kj.pdf.

Marcc & GTC

Check out page 1 on the Astor KJ-2 sheet. It mentions substituting a 6B6G with a 75.

So a duo-triode is substituted for a duo-diode-triode?

No, a 6B6G is a 75 with an octal base.

Ah, so it is. My (erroneous?) data for 6B6 is entirely different from 6B6G.

Part of the confusion may come from the fact that the original All Metal Octal series never included the 6B6. The closest metal octal version of the 75 at the time was the 6Q7.

I can only find a reference to a twin triode 6B6 in the Ludwell Sibley Tube Lore book. Apart from mentioning of "an apparent duplication of numbers on an entirely different tube", no other details are given.

Thanks for the additional info.

Marcc: Radiomuseum is lacking a picture of that model. Perhaps you or your mate can oblige?

OK! The info has been found. The chassis has the label 75 on it, but it definitely has a 6B6. From memory 6B8 (Triode 2x diode) has the same pin outs, but being a Pentode has the extra pin active for the screen Valve now removed: Cleaning testing phase.

I have KJ-1 sheet open at the moment & it also has mod. Now that I have had a bit of a look at it (i.e. got a look at it) there are Heinz 57 varieties of caps in it & the filters are wrong as mentioned.

There will be a bit of work before I even contemplate hitting it with power.

At the moment the cabinet & the chassis are about 8Km apart. But I can take a photo of it once it is sorted out.

Marc