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ARC SP6 mod question

gadget73

gadget73

junk junkie
Subscriber
I encountered an ARC SP6 yesterday that appears to have what I can best describe as tube doublers. The main board at a glance looked original, but plugged into each socket was a board that contained two 9 pin sockets, each with a 12AX7. Didn't study the wiring of these boards but I'm guessing its running the sections in parallel. Effectively the 6 tube preamp is now a 12 tube preamp. A quick scan through ARCDB doesn't seem to show this as any factory modification. Does anyone know what might be going on here?

Not mine, not working on it, just curious what I was looking at.
 
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In the past I acquired a very heavily modified ARC SP6-SE (w/remote transformer), and later a modified SP3a-1, so I had to do a lot of online research and consultation with ARC; and I have never heard of, nor seen any configuration of the mod you speak of in these models that you've come across, with two socket boards. I can almost say with confidence that what you're seeing is not factory spec or a mod that ARC did.
The only other tubes I seen in the SP6's is using a Western Electric 420A's with adapters in place of 12AX7's, and read where someone else used a 12AZ7 mod in it. The SP6 E & SE uses 6DJ8 in V3 & V6.

Will be reading in interest
 
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