[Amps] SB220 Meter blown

[Artek Manuals]

Comments below

On 5/15/2020 12:13 PM, Jim Thomson wrote:
> Date: Fri, 15 May 2020 11:10:06 -0400
> From: Artek Manuals <Manuals at ArtekManuals.com>
> To: "amps at Contesting.com" <amps at contesting.com>
> Subject: [Amps] SB220 Meter blown
>
> <I am resurrecting a SB220 that had an apparent classic Grid/plate short
> <event. One of casualties appears to be the right hand meter movement.
> <This is the one for Grid Current and HV. I am pretty far into it and the
> <meter movement measures open , the internal shunt resistor is blackened
> <( and open?)
>
> <Anyone got a surplus movement from a parted out unit? Nothing found on
> <evil-bay at the moment
>
> <Dave NR1DX
>
> ## I believe harbach sells replacements. The heathkit shop might sell em.

They only have "meter diode/ resistor boards" no actual meter movements

The rest below are all good ideas but moot if I cant find a meter 
movement, Nothing in my manual says what the actual values of the 
movement is either 8^(

> Next time be sure to install rvs connected 6A10s or 1N5408s between
> B- of hv power supply caps..... and chassis. HV fuse, followed by 50 
> ohm glitch resistor is series
> with B+.
>
> ## Toss all the grid chokes and caps. Bond each of the 3 x grid pins 
> directly to chassis
> with strap.
>
> ## Install a 2nd HV fuse...in series with one leg of the plate xfmr 
> secondary....either leg.
>
> ## Ok, now there is no way to blow anything up..including meters. Cro 
> bar anything u want,nothing happens
> except for a blown hv fuse.
>
> Jim VE7RF
>
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-- 
Dave
Manuals at ArtekManuals.com
www.ArtekManuals.com


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