03-07-2014, 07:57 PM
Wasn't sure if you where looking for one to use or look at. If weight is an issue then go for the B it's about 10pounds. no modulator section.
http://www.flickr.com/photos/53710524@N0...otostream/
http://www.flickr.com/photos/53710524@N06/8748273725/
Downside is very hard to come by. You may have noticed that the front panels on the B and C models are a bit more deco looking, the D is a bit plainer.
It's not uncommon to run into a C with the CMA-50 upgrade. (pre amp). I've used this circuit on the C to increase audio level to the modulator tubes.
http://www.swedeart.com/harvey/articles/...1-pic1.jpg
http://www.swedeart.com/harvey/collector...s50dvr.jpg
It's from Oct '55 CQ magazine. I uses it in my old grey one with a WWII T-17 carbon mike works great!!! You can play with the R/C values to change the fq response.
If you are contemplating using it on HF w/the vfo you'll be chasing your contact up and down the band! The vfo is awful! Poor design lots of heat inside which causes it to drift badly. It's useable on 80 on A3 but not so good on A1. Forget 40 and up . A good substitute is the Heathkit VF-1. Use a separate p/s for it. Work well on all bands.
As I noted the replacement loading cap that was a common modification for these sets. If you read the manual the original loading cap requires a additional cap in parallel with it on 80 and 40mtrs. It may not be a bad idea to grab a spare set as it's not uncommon for the tank coils to be in bad shape or missing.
Have found these little transmitters to be very reliable over the years. They have excellent audio on AM. I've had a bunch of them and have repair a fair number too! Customers where always happy with the end product. Soon as I get you antenna back up I'll have one on the air.
Terry N3GTE
http://www.flickr.com/photos/53710524@N0...otostream/
http://www.flickr.com/photos/53710524@N06/8748273725/
Downside is very hard to come by. You may have noticed that the front panels on the B and C models are a bit more deco looking, the D is a bit plainer.
It's not uncommon to run into a C with the CMA-50 upgrade. (pre amp). I've used this circuit on the C to increase audio level to the modulator tubes.
http://www.swedeart.com/harvey/articles/...1-pic1.jpg
http://www.swedeart.com/harvey/collector...s50dvr.jpg
It's from Oct '55 CQ magazine. I uses it in my old grey one with a WWII T-17 carbon mike works great!!! You can play with the R/C values to change the fq response.
If you are contemplating using it on HF w/the vfo you'll be chasing your contact up and down the band! The vfo is awful! Poor design lots of heat inside which causes it to drift badly. It's useable on 80 on A3 but not so good on A1. Forget 40 and up . A good substitute is the Heathkit VF-1. Use a separate p/s for it. Work well on all bands.
As I noted the replacement loading cap that was a common modification for these sets. If you read the manual the original loading cap requires a additional cap in parallel with it on 80 and 40mtrs. It may not be a bad idea to grab a spare set as it's not uncommon for the tank coils to be in bad shape or missing.
Have found these little transmitters to be very reliable over the years. They have excellent audio on AM. I've had a bunch of them and have repair a fair number too! Customers where always happy with the end product. Soon as I get you antenna back up I'll have one on the air.
Terry N3GTE
