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In Reply to: RE: hot amp switch box posted by vinnie2 on June 06, 2017 at 15:18:52
Well I got it all put together as you can see in the photos. The resistors (10 ohms/30 watts) on each set of speaker terminals seem to work ok. I played them both for about half an hour this evening and did not encounter any problems. I used a rat shack switcher unit with the output going to my altec granadas. Just have to push one button to switch between them; both amps are on all full time.
Now comes the really interesting part... I listened to some blues and some jazz (will listen to pop and classical tomorrow) and I really could not hear any difference between the amps on any of the music I played. I was very careful to balance the volumes very closely before I started comparing them so that it was not a factor. This is not the first time I have had something like this happen. I really think the fact that they are both single ended has more bearing on their sound than the specific tube, even though the 813 is straight triode and the 6bq5 is triode for the driver and pentode for the output. The other interesting thing is the 813 amp has magnequest fs 030 opts in it and the 6bq5 only has 125 ese's. Makes you wonder how good it would sound with a really good set of opts. That would be an interesting experiment, and one I may have to try (like with the fs 030 opts maybe?). Any way it has me thinking about building a finished 6bq5 for my main amp and using the 813 parts for other experiments. I will be listening to a lot more music before I decide on that, but I never expected it to be so close right out of the box.
I know who I am calling when I need some tubes!!!
Great shop and it is obvious you are enjoying it.
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