The 26 is a sweet sounding tube but I could never get the hum out of it. I tried batterys and that didn't work and to be honest there ought to be a way to have it almost silent hum wise without going to an elaborate battery and charging system.
Didn't manufactures have 26's in the preamp sections of many of the old radio circuits?
I've seen Kevin Kennedy's schematic of a 26 showing the UTC HA-133 transformers but haven't been able to source any of them at a reasonable price.
Is there a substitute transformer that is more cost effective that will also work?
Didn't manufactures have 26's in the preamp sections of many of the old radio circuits?
I've seen Kevin Kennedy's schematic of a 26 showing the UTC HA-133 transformers but haven't been able to source any of them at a reasonable price.
Is there a substitute transformer that is more cost effective that will also work?
burnedfingers said:
Check with Jack over at Electra-Print, he made me some custom transformers for my headphone amplifier project and I was quite pleasantly surprised by both the quality (performance) and the cost.
Unfortunately for looks 26's benefit greatly from electrostatic shielding.. External fields are often a problem with this tube. I got a 10dB improvement in hum by making a simple set of grounded copper foil shields. Aluminum foil works well in a pinch..
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