Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: jerrydyer on July 13, 2011, 11:17:01 am

Title: I need your help my brothas
Post by: jerrydyer on July 13, 2011, 11:17:01 am

Got a Mig 60 Sovtek. great amp actually. I put the PPIMV on it and cranked it for 30 minutes sounded killer. smoked the 220 ohm 10 watt resistor that it uses as a choke. this amp has el34 and only uses 780ohm screen wire wound 5 watts. should I raise that to 1k and maybe use a 25 watt 220 ohm since its going to be used cranked all the time. ?  fun amp. I love the tone even before i put the post pahse in there.

thanks y'all  :worthy1: :worthy1: :worthy1: :worthy1: :worthy1: :worthy1:

Title: Re: I need your help my brothas
Post by: mac0611 on July 13, 2011, 11:57:59 am

If you are going to crank it all the time I would use 2k screen resistors and 100k for the bias grid leak resistors to help prevent bias excursion which is probably why your choke resistor fried.

Title: Re: I need your help my brothas
Post by: jerrydyer on July 13, 2011, 12:11:38 pm

thanks
how about the 220 ohm. I see some marshalls use 270 ohm 10 watt. would it benefit me to raise this ohmage and wattage. there is room for the larger wattage 220 ohm

Title: Re: I need your help my brothas
Post by: jojokeo on July 13, 2011, 01:19:54 pm

Hi Jerry,
I think going to a rating over double what's been there should be plenty and what I'd do keeping things cooler and practically bullet-proof. The slight increase from 220 to 270 isn't that big a deal IMHO.

Title: Re: I need your help my brothas
Post by: jerrydyer on July 13, 2011, 01:53:53 pm

yeah cool thank you
this 220 ohm was not even 5 waTTS.

its a small brown 330 ohm   from russia    lol