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Title: Boston Transformer Company Post by: ka1tdq on April 24, 2020, 07:44:42 PM I got this transformer today and I'm curious about its history. It's made by the Boston Transformer Company out of Cambridge and I'd like to find out anything about it or the company. I did some Googling but came up with nothing.
It's overkill for my plans to build a single 3-500 linear out of it, but I'd like a story to tell too. Jon Title: Re: Boston Transformer Company Post by: W7TFO on April 24, 2020, 10:56:39 PM Nice iron... ;)
73DG Title: Re: Boston Transformer Company Post by: WZ1M on April 25, 2020, 03:15:13 AM .
Title: Re: Boston Transformer Company Post by: ka1tdq on April 25, 2020, 06:12:12 AM Yes, I stopped over at Dennis' place yesterday and got this along with lots of other goodies. A literal candy store. He asked me how my heart was before he lifted the door to 'one' of his storage units. I walked in and looked around and said that I was going to cry. Anyway, I know where to go next time for parts.
The transformer does have a secondary center tap, so I'll run the tube at around >2000 volts. The picture shows the two cabinets. The one on the right will be the B+ power supply and the left with the glass door will be the RF deck. Three bands this time (80/40/20) so that I can use my plastic radio with it too along with the 75m AM tube rig I'm finishing. Jon Title: Re: Boston Transformer Company Post by: KF7WWW on April 26, 2020, 08:04:44 PM Nice small piece of iron. I have a couple back breakers that came from the iron menace also. ;D
Remember Jon I have a few parts also. Don’t be afraid to get ahold of me. Title: Re: Boston Transformer Company Post by: KD6VXI on April 26, 2020, 08:12:28 PM Nice small piece of iron. I have a couple back breakers that came from the iron menace also. ;D Remember Jon I have a few parts also. Don’t be afraid to get ahold of me. When you coming over to Paso? --Shane KD6VXI Title: Re: Boston Transformer Company Post by: KF7WWW on April 27, 2020, 07:24:28 AM Nice small piece of iron. I have a couple back breakers that came from the iron menace also. ;D Remember Jon I have a few parts also. Don’t be afraid to get ahold of me. When you coming over to Paso? --Shane KD6VXI All of that has seemed to be in a holding pattern for what has felt like forever. Family’s seem to get extra strange when the elders start passing away. I still have the filament transformers you wanted. If I have to I guess I could ship them. I still have your number , if it’s the same I’ll continue the convo there? Title: Re: Boston Transformer Company Post by: WBear2GCR on April 28, 2020, 05:28:34 PM <snip> The picture shows the two cabinets. The one on the right will be the B+ power supply and the left with the glass door will be the RF deck. <snip> Jon Curious, with a glass door in the front, unless it is a "no tune" design, how will you handle the knobs and switches, not to mention the meters?? Also, it is generally considered "good practice" to have an RF emitting QRO device in a fully shielded enclosure... Title: Re: Boston Transformer Company Post by: ka1tdq on April 28, 2020, 05:35:29 PM I'm going to hang a large Hammond enclosure from the top of the cabinet with four 1/4-20 rods. Tube, caps and stuff all will be mounted on top of the Hammond enclosure. It will be pressurized with a quiet blower. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Meters, input band switching, and filament choke will be on the inside of the Hammond enclosure but in their own smaller, isolated enclosures (3 inside boxes). That way dust doesn't build up on them. I would need to open the front door to tune the amp. The glass front would be the only thing not metallic for RF purposes. At 150 watts carrier it probably doesn't matter. I've run a 2KW (1500 watts or so) PEP class E rig that was completely exposed. Jon |