Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: isaac_teller on September 18, 2023, 11:06:05 am

Title: National Dobro 400
Post by: isaac_teller on September 18, 2023, 11:06:05 am

Hello. Just noticed something on this schematic. There should be a grid leak resistor on the grid of V4a. What would its value be?
https://el34world.com/charts/Schematics/files/Valco/National_Dobro_400.jpg

Title: Re: National Dobro 400
Post by: sluckey on September 18, 2023, 01:19:03 pm

100K.

Title: Re: National Dobro 400
Post by: isaac_teller on September 18, 2023, 03:13:37 pm

Thanx.

Title: Re: National Dobro 400
Post by: kagliostro on September 18, 2023, 03:38:47 pm

Better ?

(https://i.imgur.com/Aq8z6bT.jpg)

Franco

Title: Re: National Dobro 400
Post by: isaac_teller on September 19, 2023, 10:47:42 am

Perfect!