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Old 7th December 2012, 05:54 PM   #11
20to20 is offline 20to20  United States
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There is a circuit type that you could build on this chassis without adding a driver and socket. It's called a self-inverting push-pull, and you would rewire the existing inverter socket to take the driver tube and that's all you'd need. Apart from the gut job. Those output trannys look to be UL, too. On the bright side, you got your money's worth on the parts, if they're all good.
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Old 7th December 2012, 06:47 PM   #12
trigger is offline trigger  United States
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what would be more simple, adding a driver tube or adding transistors for phase splitting?
ive got lots time and a lots of extra parts...
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Old 7th December 2012, 06:58 PM   #13
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I'm betting that this is an old Magnavox amplifier from a console stereo.
It's not a Zenith. Back then, Zenith copper-coated the inside of their chassis.
I once owned a Magnavox mono amplifier which was built on a very similar chassis.
It used a 5Y3, 12AX7 and a pair of 6V6 tubes.
This amplifier might be worth a rebuild before you dismantle the original amplifier and use the chassis to build another. The performance may surprise you!
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Old 8th December 2012, 01:33 AM   #14
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Quote:
what would be more simple, adding a driver tube or adding transistors for phase splitting?
That depends, at least in part, on how well set up you are to do sheet metal work.

I'm no fan of BJTs, but FETs are a very different story. A FET is darned close to being a heaterless pentode. FETs work well in "unity" gain situations, like voltage followers and split load ("concertina") phase splitters. Enhancement mode "N" channel parts are extremely easy to DC couple to tube plates.

Let's say, for sake of argument, that a 12AX7 section will be the voltage amplifier. The FET to use is the ZVN0545A. Even the wimpy 'X7 triode has no problem in driving it's tiny capacitances.
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