SET Asylum

RE: Good driver tube for PX25 / DET5

51.174.165.53

iodemus

A

In Reply to: RE: Good driver tube for PX25 / DET5 posted by Paul Joppa on June 09, 2020 at 07:56:33

I plan to use the best oil caps and Lundahl LL1668 plate choke, or consider to eliminate the caps with Lundahl LL1671 combined plate choke/interstage trafo.

Grid chokes in both stages and driver filament filters C-L-C .
All monobloc SEDHT amps I've made are quiet on Avantgarde Duo (107dB) with shorted inputs.
Are the Ca or 3A/110B tubes capable drivers for DET5?

Thanks, Johnny.

Follow Ups:

RE: Good driver tube for PX25 / DET5 - Paul Joppa 14:30:52 06/09/20 (1)
I found some curves for the 3A/110B which look very good; haven't found any for the Ca. Ca has a mu of ~8.
- RE: Good driver tube for PX25 / DET5 - iodemus 22:55:14 06/09/20 (0)
  Both 3A/110B, Ca, Aa, Ce, Da, Ba, Bh, Ec and similar are made for telephony in war situations and need to be as linear as possible.
  For military use it was important to have a good communication and hear clearly what was said in the other end. Even my 102D and 101D tubes in the "Geiru Chan" amps from abt. 1920 are superior regarding linearity, distortion, noise and lifetime. 50.000 hours + are estimated. In 1920!
  
  Johnny.

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