[Amps] SB220 Meter blown

[Robert Arenella]

         Contact Lou, W1QJ.  He does 6 Meter conversions on SB-220's 
among others.  Ha may have what you need.

73,
Bob / N2OAM



5/15/2020 1:14 PM, Artek Manuals wrote:
> 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
>>
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>