bill-g
New Member
I turned 62 today, and thought I should post a tribute to my Fisher 250T.
Still using it as my main amp. Here, I'm guessing this is regarded as a sterling virtue, but by most other people as a symptom of pathology. Maybe this is changing though. Just think of all the hi-fi equipment I haven't tossed in the landfill.
Bought used in 1972. When I found it, I remembered drooling over one on display in the window of TEAM Electronics back in about 1969. Bought for $200, and have kept it running all these years. Not without some effort though....
Several times over the years, opened it up to blow out the dust, clean the pots, and check & adjust output bias.
One big improvement was to replace the RCA jack panel in the back with an aluminum plate and better jacks. The original was a piece of copper clad fiber board with cadmium plated jacks swedged into it. I started hearing radio stations on the aux and tape monitor circuits, I finally realized some sort of contact diode thing was happening in the ground leg where the cheapo RCA shells were pressed into the copper with no solder.
Replaced the stock 330/33 ohm headphone divider with 160/160 ohm resistors, works well with headphones of all impedances.
Replaced the big capacitors with bigger ones long ago.
I restored a Pioneer SX-939 last year (I thought..), and had retired the 250T to the garage. Turns out, I missed a few things in the SX. There are a few more caps needing replacement, and the DeOxit cleaning of the too may switches didn't quite hold.
Put the Fisher on the bench, gave it a good cleaning with DeOxit including all the Tune-O-Matic pots, and it swapped places with the Pioneer. Found a nifty 6-way stereo patch box on that I use to handle all the inputs I couldn't manage before. Tune-O-Matic still works. Phono preamp is still pretty damn good.
FM tuner drifts a bit as it warms up. Since it's varactor diode tuning, suspect this is due to power supply regulation.
There's a zener diode with a series thermistor that looks to be a voltage reference in the power supply. Thinking about solutions to this, but maybe that's worth a new thread.
Front panel and knobs looking a little rough due to age and some poor cleaning choices, but still attractive as a receiver "of a certain age". Probably helped that it's been kept in frequent use all this time.
BTW, thanks to mhardy6647 for posting the link to the scanned 1970 Allied Radio catalog! I browsed and found the 250T in there. Way cool.
Long live the 250T.
Still using it as my main amp. Here, I'm guessing this is regarded as a sterling virtue, but by most other people as a symptom of pathology. Maybe this is changing though. Just think of all the hi-fi equipment I haven't tossed in the landfill.
Bought used in 1972. When I found it, I remembered drooling over one on display in the window of TEAM Electronics back in about 1969. Bought for $200, and have kept it running all these years. Not without some effort though....
Several times over the years, opened it up to blow out the dust, clean the pots, and check & adjust output bias.
One big improvement was to replace the RCA jack panel in the back with an aluminum plate and better jacks. The original was a piece of copper clad fiber board with cadmium plated jacks swedged into it. I started hearing radio stations on the aux and tape monitor circuits, I finally realized some sort of contact diode thing was happening in the ground leg where the cheapo RCA shells were pressed into the copper with no solder.
Replaced the stock 330/33 ohm headphone divider with 160/160 ohm resistors, works well with headphones of all impedances.
Replaced the big capacitors with bigger ones long ago.
I restored a Pioneer SX-939 last year (I thought..), and had retired the 250T to the garage. Turns out, I missed a few things in the SX. There are a few more caps needing replacement, and the DeOxit cleaning of the too may switches didn't quite hold.
Put the Fisher on the bench, gave it a good cleaning with DeOxit including all the Tune-O-Matic pots, and it swapped places with the Pioneer. Found a nifty 6-way stereo patch box on that I use to handle all the inputs I couldn't manage before. Tune-O-Matic still works. Phono preamp is still pretty damn good.
FM tuner drifts a bit as it warms up. Since it's varactor diode tuning, suspect this is due to power supply regulation.
There's a zener diode with a series thermistor that looks to be a voltage reference in the power supply. Thinking about solutions to this, but maybe that's worth a new thread.
Front panel and knobs looking a little rough due to age and some poor cleaning choices, but still attractive as a receiver "of a certain age". Probably helped that it's been kept in frequent use all this time.
BTW, thanks to mhardy6647 for posting the link to the scanned 1970 Allied Radio catalog! I browsed and found the 250T in there. Way cool.
Long live the 250T.