Daven MU-20 Data

Atwater10 · **Posted:** Oct Sat 13, 2001 2:00 am

Hello All, I wonder if anyone has tube data to test a Daven MU-20 amplifier tube? It has a 6 volt fillament and is a 4-pin triode.Thanks, Chuck------------------

Norm Leal · **Posted:** Oct Sat 13, 2001 5:45 am

Hi Chuck The number MU 20 means it has a gain of 20. At 6 volts the filament current is .25 amps. Plate voltage can be up to 150. Negative grid voltage -4.5 to -10.5 volts depending on plate voltage. Output resistance 40,000 ohms. This is how it's listed in S. Gernsback's Radio Encyclopedia 1927. No currents are given. If it passes as a 40 should be ok.------------------ Norm

Atwater10 · **Posted:** Oct Sat 13, 2001 7:04 am

Thanks Norm. Its a beautiful addition to my tube collection.Regards, Chuck------------------

busterdog57 · **Posted:** Dec Fri 07, 2018 10:53 pm

Does anyone know what tubes are good substitutes for the Daven MU-20? Hoping 01a might do the trick...

Braithwaite · **Posted:** Dec Sat 08, 2018 1:11 am

The best replacement will be a type 40 (240, 340) tube with an amplification factor of 30. The amplification factor of the Mu-20 was, of course, 20. The circuit will likely limit actual amplification of the stage to something less than 20. If amplification is not a big concern, an 01A with an amplification factor of 8 should work.

This thread should be moved to "tubes & parts", a category that did not exist at the time of the first post.

Norman

busterdog57 · **Posted:** Dec Sat 08, 2018 2:03 am

Excellent, thanks!

Daven MU-20 Data

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