Tube DIY Asylum

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

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RE: 20B fun without Nreaking the Bank...

Posted by drummerwill on January 18, 2017 at 19:15:19:

for my latest build I wanted an all DHT front end. I thought
about EML's 20B, but I just couldn't see paying that cost...

My solution was to use the Type 26 DHT. ..........

A single 26 can drive a 2A3 or a 45......caveats are 1) you must use
DC filaments to lower hum. and 2) the gain from a single Type 26 is not
much.

I use 2 stages of Type 26's cap coupled and both 26's on a common filament supply. This arrangement allow 1) Twice the gain for the output
tube and 2) provides Humbucking noise canceling for the filaments..
My amp has all AC filament heating.

Have fun
Willie