Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: joesatch on September 07, 2023, 02:06:40 pm

Title: Replicate tube stage with LND150's
Post by: joesatch on September 07, 2023, 02:06:40 pm

Can these stages be replicated with LND's?  wrong answers only. I want to avoid using a tube for this output stage as it is only for boosting the level, not part of the preamp

Title: Re: Replicate tube stage with LND150's
Post by: bmccowan on September 07, 2023, 02:37:23 pm

Quote

Can these stages be replicated with LND's?  wrong answers only.

OK, I think I can provide a wrong answer; only if shaken, not stirred.

Title: Re: Replicate tube stage with LND150's
Post by: sluckey on September 07, 2023, 02:41:33 pm

http://www.geofex.com/Article_Folders/mosfet_folly/mosfetfolly.htm

Title: Re: Replicate tube stage with LND150's
Post by: joesatch on September 09, 2023, 09:27:00 am

ok i replaced the triodes with LND's the result is quite good although less bass (i guess just cleaner) than the triode and output is considerably higher. i will need to play with the voltage divider to get the output manageable.  I will go with this. there is some mention of using diodes to protect the transistor and possibly a 200R resistor somewhere but i'm unsure where.