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Very nice write-up! :)
I don't like the exposed contacts on the side of the base.
They don't look very safe.
I have used 5670 to 6SN7 adapters/tubes with...
It's like what @cddc said above - it really all depends on what the design/implementation of your amp entails. If your amp has a...
I concur with mordy...they were most likely all made by RCA.
The difference in sound can be caused by different burn-in stages, also it...
For sure, enough room to hold these large caps and chokes :beerchug:
Looks like he left some room for some mods. Which was clever. :wink: