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Old 17th August 2019, 04:26 PM   #11
HarryY is offline HarryY  United States
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TU-8500  12AU7 vs 12A??
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Originally Posted by HarryY View Post
The 12AU7 has a plate resistance of 7,700 ohms
The 12AT7 has a plate resistance of 10,900 ohms

The 12AT7 is actually the higher of the two.

A better selection may be the 5751 with a plate resistance of 5,800 ohms.
That is if the TU-8500 can handle the higher filament current of
175 mA (at 12.6v) over the 12AU7 filament current of 150mA (at 12.6v).
Disregard this with the 5751 I read the plate resistance wrong
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Old 17th August 2019, 06:23 PM   #12
paczeltf is offline paczeltf  Hungary
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Quote:
Originally Posted by HarryY View Post
The 12AU7 has a plate resistance of 7,700 ohms
The 12AT7 has a plate resistance of 10,900 ohms

The 12AT7 is actually the higher of the two.
Victor may have meant the output impedance of the preamp.
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