Preamp Tubes for DR-103
Posted: Wed Feb 01, 2017 6:38 pm
Hi all,
I know that in traditional cathode follower applications you can't use spiral filiment type tubes because the maximum cathode-to-heater rating of 100 volts is exceeded, which causes them to fail very quickly. This rules out anything (current production) from New Sensor for that position on a Marhsall or similar amp (Tungsol, Mullard, Sovtek RI's).
I also know that V3 in the DR-103 has been described as NOT being a Cathode Follower, but instead just providing a reference voltage for the phase inverter. Does that mean I would be OK using the (current production) Tungsol in that position on the Hiwatt (and in all other preamp positions)?
Many thanks
TRJB
I know that in traditional cathode follower applications you can't use spiral filiment type tubes because the maximum cathode-to-heater rating of 100 volts is exceeded, which causes them to fail very quickly. This rules out anything (current production) from New Sensor for that position on a Marhsall or similar amp (Tungsol, Mullard, Sovtek RI's).
I also know that V3 in the DR-103 has been described as NOT being a Cathode Follower, but instead just providing a reference voltage for the phase inverter. Does that mean I would be OK using the (current production) Tungsol in that position on the Hiwatt (and in all other preamp positions)?
Many thanks
TRJB