Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Tone Junkie on October 24, 2016, 01:49:08 am

Title: Neon lamp on cathode follower
Post by: Tone Junkie on October 24, 2016, 01:49:08 am

In Merlins book designing tube preamps second addition . he talks about using a neon lamp for grid cathode arc protection on his cathode follower . But doesnt tell me what kind of neon lamp to use . any ideas.
Thanks
Bill

Title: Re: Neon lamp on cathode follower
Post by: kagliostro on October 24, 2016, 05:25:47 am

Merlin says 90v neon lamp (model without in series resistor) or, as alternative a 10k resistor with a diode (1N4007 may be) placed in series

Here you can find the 90v neon lamp (look at (LMP) NE2)

http://www.surplussales.com/bulbs-incan-panel/BulbsNeon.html (http://www.surplussales.com/bulbs-incan-panel/BulbsNeon.html)

Franco





 

Title: Re: Neon lamp on cathode follower
Post by: Tone Junkie on October 24, 2016, 06:34:44 pm

Thank You Franco . I have tried the other way and wanted to use this way once to see which I preferred.
Bill