[Elecraft] SB-221 for K3 need some help.

[Joe Subich, W4TV]

> I found out this week that K3 is good with Heathkit
> SB-220 amps, all you need to do is connect a shielded
> RCA cable between the units - how easy is that? !!!

Are you sure?  Most of those amplifiers had high voltage PTT 
circuits.  If I recall correctly the TR relay is a 120V 3PDT
unit.  You may need a buffer or soft-key circuit in your 
amplifier to make it safe with the K3. 

> If anyone knows where I can get a bandswitch wafer for
> the input coil selection I may be able to use this amp
> I bought. ;-)

At one time Harbach Electronics www.harbachelectronics.com 
had replacement wafers for the Heath amps.  Check with Jeff. 
He's also a good source of a "soft-key" circuit for the 
older amps. 




> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don Rasmussen
> Sent: Sunday, August 31, 2008 1:19 AM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] SB-221 for K3 need some help. 
> 
> 
> Hi Guys,
> 
> I found out this week that K3 is good with Heathkit
> SB-220 amps, all you need to do is connect a shielded
> RCA cable between the units - how easy is that? !!!
> 
> I also found out that UPS had shattered the bandswitch
> on the sb221 I recently received and Heathkit is no
> longer around to get parts from. hi. 
> 
> If anyone knows where I can get a bandswitch wafer for
> the input coil selection I may be able to use this amp
> I bought. ;-)
> 
> Thanks,
> Don
> 
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