Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Oddvar on May 11, 2019, 02:37:08 am

Title: What fuse in Bandmaster 230v?
Post by: Oddvar on May 11, 2019, 02:37:08 am

Hi.  Is 2A slo blow fuse sufficient in a 230V Bandmaster build?

Title: Re: What fuse in Bandmaster 230v?
Post by: sluckey on May 11, 2019, 02:53:07 am

Schematics specify 2A slo for 120V operation. If you double the supply voltage you would typically half the fuse rating.

Title: Re: What fuse in Bandmaster 230v?
Post by: Oddvar on May 11, 2019, 05:14:10 am

So 1A would be good?

Title: Re: What fuse in Bandmaster 230v?
Post by: sluckey on May 11, 2019, 08:57:41 am

I don't know. Is that half the fuse rating???   :dontknow:   :think1:  :wink:

Title: Re: What fuse in Bandmaster 230v?
Post by: pdf64 on May 11, 2019, 01:57:53 pm

The point being that you should check what mains fuse is used in the domestic USA amp, and halve that value for use at 230V with a 230V primary PT.
It will need to be a 'T' type time delay / slow blow.