Steve:
Glad to hear you got it figured out in short order. If only the majority of
repairs in amplifiers were as easy as this one. Thankfully, the tried and true
3-500s are still in production, and not for an arm/leg.
The forum here seems to be a faint example of what it once was. I hope everyone
I am used to seeing here is well, and still enjoying the hobby.
Don N8ECH
On Monday, October 5, 2020, 10:32:42 PM EDT, Steve AA7V
<aa7victor@gmail.com> wrote:
Hello to the group;
First, thanks to the many folks that took the time to answer my inquiry.
Your responses are greatly appreciated.
Second, I removed one of the tubes, powered on the amp and the behavior
seen before was gone. I found and installed a spare and now the amp is back
to normal ops.
The faulty tube is 6 years old. I dont know what the normal life-span is
for a 3-500z but I had hoped for a few more years.
73 to all
Steve AA7V
On Mon, Oct 5, 2020 at 11:03 AM Steve AA7V <aa7victor@gmail.com> wrote:
> Hello to the group;
>
> My SB220 has started to act up.
>
> Immediately upon power on, the 3-500s both start drawing plate current.
> The meter shows approximately 250 ma of current. It is apparent some
> component has failed.
>
> Also, it appears the grid current meter is showing a negative value (if
> this is possible) as the needle now rests on the left peg.
>
> I am not adverse to troubleshooting to the component level but would
> appreciate any advice as to how to narrow my search to a specific set of
> probable causes.
>
> If I am unable to fix this amp, does anyone have any recommendations
> towards a person that works on SB220s?
>
> Regards
>
> Steve AA7V
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|