Tube DIY Asylum

RE: Adjusting Plate Voltage on Preamp Output Tubes

206.228.220.38

In Reply to: RE: Adjusting Plate Voltage on Preamp Output Tubes posted by casouza on June 30, 2009 at 19:15:01

I have the datasheets for both the 2C22 and 6SN7. The operating points are exactly where Supratek set them for the stock tubes (one 6SN7 per side) - the first half of the 6SN7 is run at 0V grid and 100V plate and the plate is directly coupled to the grid of the second half of the 6SN7, which is run with the plate at 230V. This is typical of what is shown in the 6SN7 datasheet for a two stage amplifier. What I did was to substitute the single triode 2C22 for the first half of the 6SN7, and just go without a second gain stage, so the anode and cathode of the 2C22 are connected to the output tranformers through a DC blocking cap. The 2C22 thus sees the same voltages that the first half of the 6SN7 did

It sounds excellent like this, believe it or not! Looking at the 2C22 plate curves on the datasheet, however, it looks like going up to 150V or so will put me in a more linear part of the curve, so I'd like to try that, hence the post.

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