[MAMS] Sad Note with 222 AM6155 AMP

[Dr. Gerald N. Johnson]

It might be easier to find a small filament transformer than an 
original. Didn't like 240 volts on the 120 volt primary? Usually takes 
about 35 volts operating bias, more for blocking and shut down. 
Connecting a small 6.3 filament transformer to the tube heater 
transformer, low voltage winding to the heater circuit makes a simple 
120 volt AC isolation transformer. If you need only 50 volts AC use a 
12.6 volt filament transformer. Need not have significant power 
capability for bias circuits usually.

In times past, Fair Radio has had AM6155 parts.

73, Jerry, K0CQ

On 12/23/2012 7:22 PM, MARK K8MD wrote:
> Today i decided to move Am6155 222  to 240 VAC after proper jumping of amp and changing connector for VAC. I turned amp on and a fuse blew. I found out previous person who tried to run amp had a 3A fuse instead of 15A. Replaced and still would not run, no blower noise. After an hour of checking, and checking. I tried to get it to go comparing it to my 432 AM6155 and heard blower turn on for a second and smoke came blowing out of amp.
>
> Upon pulling the grid bias section say that the transformer smoked and burned pretty good. What Luck. These amps are getting rare. I'm going have to find someone parting out a unit. I think I'll drag out old amp and replace tube socket on pair of 4CX250's and see if that will run. I still have supply that never smoked for the 15 years I used for the 4CX250's.. If anyone knows of someone parting out AM6155 let me know . Thanks Mark, K8MD
> ______________________________________________________________
> MAMS mailing list
> Home: http://mailman.qth.net/mailman/listinfo/mams
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:MAMS at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>