26 preamp to 01a question

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

I'm in the process of breadboarding this preamp design from the V-52.com site. I have good chokes in PS and steady well-filtered 1.5 to 5V DC for filaments. I decided to change from 26 to 01A, for a couple reasons: I think 5v filament is easier to supply, and I have a number of good old 01A tubes. The understanding I get from research is that 26 and 01A both sound equally good, though the 01A is fairly weak at about 3mA.

My question is, will I change the cathode resistors, currently (no pun intended) shown as 2200 ohm? I measure 9 VDC at the junction of the 22 ohm Rs and the 2200ohm R. This is with 125VDC on the 01A plates. Thanks for any info.

Pete

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Topic - 26 preamp to 01a question - PeterI 15:31:47 02/19/17 (6)

Build the Bartola Gen 2 01A preamp - andy evans 01:21:13 02/20/17 (2)

RE: Build the Bartola Gen 2 01A preamp- Thx - PeterI 12:03:03 02/20/17 (1)

Might not be that hard to build - it's just PCBs - andy evans 14:11:03 02/20/17 (0)

RE: 26 preamp to 01a question - Chip647 18:12:27 02/19/17 (2)

RE: 26 preamp to 01a - results, Pic - PeterI 19:40:56 02/23/17 (0)

RE: 26 preamp to 01a question- Thx - PeterI 12:05:44 02/20/17 (0)

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