RE: 27 preamp

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In Reply to: 27 preamp posted by vinnie2 on August 2, 2015 at 13:47:46:

Did you charge the NiMH cells before installation? Expect 1.2 V. per cell.

The net load presented to the #27 is the parallel combination of the 22 Kohm part, the 470 Kohm part, and the I/P impedance of the power amp. The R_P of a #27 is around 10 Kohms. The net load should be at least 3X R_P and, obviously, you don't get that "tall".

To put things in perspective, the R_P of a 12B4 is around 1000 Ω. That tube has no problem driving downstream stuff even as difficult as the IHF "standard" 10 Kohms.

Eli D.
#27 Data Sheet (Open in New Window)

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Follow Ups Full Thread

Topic - 27 preamp - vinnie2 13:47:46 08/02/15 (5)

arrrrgh...... - vinnie2 17:40:53 08/02/15 (0)

RE: 27 preamp - Eli Duttman 14:45:36 08/02/15 (3)

RE: Plots and distortion - deafbykhorns 18:05:01 08/02/15 (0)

RE: 27 preamp - Paul Joppa 15:16:55 08/02/15 (1)

RE: 27 preamp - Eli Duttman 15:28:50 08/02/15 (0)

Follow Ups

RE: 27 preamp - Eli Duttman 14:45:36 08/02/15 (3)

RE: Plots and distortion - deafbykhorns 18:05:01 08/02/15 (0)

RE: 27 preamp - Paul Joppa 15:16:55 08/02/15 (1)

RE: 27 preamp - Eli Duttman 15:28:50 08/02/15 (0)

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