Hi Darryl:
Some time ago, you asked a question about the value / collectibility of Guild-branded tubes.
I'm sure it seemed like a sensible question at the time and the Board responded with 3-odd pages of OT discussion. Speaking for myself, if I ever had any ideas about daisy-chaining inputs, those posts were enough to pretty much put an end to them. I don't think anyone mentioned the word tube.
Do you have one or more Guild-branded tubes? What type are they?
I browse eBay for the off-beat 6GW8 which Guild engineers insisted on for the T1 RVT outputs and 6BM8s, the reverb output tube on T1 RVT. The Gibson GA1 I have uses the same 6BM8. At some point, I'm going to re-wire the T1 outputs for EL84s; a much better sounding tube and in good supply.
Because I mess with Gibson amps, I also look for NOS 6EU7s which sell at a premium to the new Sovteks where the choice is between a more expensive, older, noisy tube and a cheaper, newer, noisy, unreliable tube. With Sovtek 6EU7s, the 'zzzzzzzzzz' is free....
Tubistas who are technically inclined would want to know:
(1) Whether it's a common type; 12AX7, 12AU7, 6L6 and so on, and
(2) Who made it.
Telefunken, Siemens, and Mullard sell at a premium. 'Market' rates are GE, RCA, Sylvania, JAN. Then there are the odd-balls: Stromberg Carlson, Lafayette, Ford (as in FMC: I have a 'Ford'-branded 6V6), and the ever popular 'No Name': "...tests great...blah blah blah..."
The enthusiasts can generally ID the mfr by looking and, though carrying a logo other than the mfr's, they sometimes still have the mfr's ID etched on them. It's my understanding of the business that 'private-labelled' tubes were not necessarily the highest grade available from prime-time manufacturers or they came from 2nd-tier manufacturers looking to fill orders.
Since Guild amps don't make many vintage waves, it would follow that only Guild ampistas might be interested. I don't look every day but I can't say I've ever seen a Guild-branded tube or set of tubes on eBay.
I'd guess that Guild ampistas probably come it two types: preservers like Mattsickma and tinkerers like me. Preservers would have a higher degree of interest; to me, they are Guildiana.
FWIW: I have a set of Gibson-logoed pre-amp tubes; 3X6EU7 + 1X7199 from the GA19 in my sig. Because interest in Gibson amps is more widespread, I'd have a better chance peddling them than you might peddling yours. Mine are working takeouts and for Mojo reasons, I'll hang on to them to sell with the amp if/when I decide to part with it.
If you own the amp they came out of and if were to sell it, I think buyers might appreciate a little 'case candy'. Otherwise you might consider LTG-Bay if you haven't already.
Best regards,
capnjuan