[Amps] SB220 Meter blown
rja12 at comcast.net
Fri May 15 14:51:24 EDT 2020
Contact Lou, W1QJ. He does 6 Meter conversions on SB-220's
among others. Ha may have what you need.
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
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