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Old 3rd Jan 2023, 10:01 pm   #15
Katar83
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Join Date: Feb 2021
Location: Thetford, Norfolk, UK.
Posts: 128
Default Re: What did I get myself into? Murphy A40C.

Quote:
Originally Posted by Leon Crampin View Post
There is an official work-around to replace the AC/SP1 with the heptode section of the TH41 or AC/TH1 (same valve, differing bases). A search of the Murphy websites should reveal the details.

In my A28 receiver, the AC/SP1 in the AF stage can be replaced with an AC/VP1, but the AFC reactance valve is critical. Alignment of these sets is an exacting job and a frequency counter is an asset to achieve symmetrical AFC action.

Leon.
I've read about this on this forum already but neither of the posts mentioning it has any actual instructions and then I couldn't find anything useful on the murphy site either.

I may have found an AC/SP1 and V914 thanks to this amazing forum, thanks all that messaged me! Will be a few days at least before I get both so I've started with the cabinet for now. First I've washed it just to avoid a tetanus shot, then started partial disassembly, removed shelf, front railings and grill and started removing old varnish, this came off very easy, with just a small amount of chipping in a few places that should be easily fixable.
Veneer is in average condition, especially the top but might still be ok, I'll know for sure after further sanding it down.
I'll probably make a new board for the speaker as the existing board has a too large hole for the goodmans speaker and I dont want to stack them up again. Non original speaker doesn't bother me, this one looks good and should hopefully work well.
Railings will be of course repainted and the only thing I'm unsure about is the grill, I wasn't a fan of it originally as it was dirty and just looked wrong but turned out this is actually a copper mesh and it might actually clean up nicely. Alternatively I either get a cloth in there or another copper mesh, what you guys think?
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Last edited by Katar83; 3rd Jan 2023 at 10:08 pm.
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