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Author Topic: Got a Harvey-Wells TBS-50C/D  (Read 23656 times)
KE0ZU
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« on: April 20, 2014, 09:15:11 PM »

Decenber 15, 2015


I've FINISHED the rebuild of this transmitter and updated this thread You'll find the final review on page 2.


Went to the Shriners Hamfest here in Kansas City, and happened across the little fella first thing, and for a very good price as well.   It had been slightly modified, and used as a linear for a QRP transmitter.   Very odd use, but it was clean, came with the "D" mic preamp, a spare set of tubes and a manual reprint.   I saw these things in QST and other places when I was a little kid, and wanted one in the worst way, but, they looked LOTS bigger in print.Grin   Hope it'll be on the air in a few weeks, but have other unfinished projects ahead of it.
« Last Edit: December 15, 2015, 12:42:53 PM by KE0ZU » Logged

Regards, Mike
https://mikeharrison.smugmug.com/
Pics and bold print are usually links.
W1BR
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« Reply #1 on: April 21, 2014, 06:55:51 AM »

Good deal, Mike!  Now, you need to find the matching VFO to park it on! The models with the mike amps are sought after.

We had one of those setups at the old Windsor Locks, CT CD headquarters back in the early 1960s. I can see it, and the Hammarlund HQ-120, and the line of Goonie Birds in my mind to this day.  I often wonder what happened to all that gear. All of the OTs who were involved passed away decades ago.

Pete
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KB4QAA
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« Reply #2 on: April 21, 2014, 06:57:20 AM »

http://www.swedeart.com/harvey/index.html

I've got two TBS-50D Bandmasters one with the VFO.   They are little swiss army knives that offered hams a great value and access to all the bands.

Clifford Harvey, W1RF, was an amazing man who founded three successful companies and specialized in meeting niches across the market including research labs, police, commercial, aviation, military as well as ham.  

Mr. Harvey's daughter posted on QRZed about three years ago and shared her memories of the floods that ravaged the factory in the 1950's.  Above is a wonderful site that is a tribute to a great ham and engineer.   bill
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KA0HCP, ex-KB4QAA Relocated to Ks. April 2019.
W9GB
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« Reply #3 on: April 21, 2014, 07:43:55 AM »

The vacuum tubes used in the TBS-50 model are classics: (2) 6AQ5, (2) 6L6, and the 807
http://www.swedeart.com/harvey/html/tbs-502.html
« Last Edit: April 21, 2014, 07:46:10 AM by W9GB » Logged
G3RZP
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« Reply #4 on: April 21, 2014, 08:47:25 AM »

How much output power did it give on 2 metres?
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K8AXW
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« Reply #5 on: April 21, 2014, 08:51:15 AM »

I used to admire the Harvey Wells transmitter when I was a very young man and had the pleasure of actually seeing one.  Like you, I was at first startled to see how much smaller than they actually looked in the ads.

Congratulations on finding a rare classic.  (Rare because they seemed to have disappeared from the planet - The ham son of the guy who owned the one I'm talking about "has no idea whatever happened to the HW Bandmaster.")

That one is a 'keeper.'
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A Pessimist is Never Disappointed!
W7VO
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« Reply #6 on: April 21, 2014, 11:59:32 AM »

I have one of those also, and recently found and bought the matching power supply for it. Mine is also a "C", later modified into a "D", which is where the "TBS-50C/D" comes from. I have yet to fire it up, but when I do it will be opposite my Hammarlund HQ-120X.

Have fun!

73;

Mike, W7VO
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KB4QAA
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« Reply #7 on: April 22, 2014, 12:07:34 PM »

How much output power did it give on 2 metres?
I can't find the reference but 2m output is 'modest' around 200mW.  Smiley   But hey, getting on 2m in 1948 was quite an accomplishment, whatever the power.

On other bands output is around 30-35 watts.

p.s.  On second thought, 200mW is equal to many HT's today.
« Last Edit: April 22, 2014, 12:12:13 PM by KB4QAA » Logged

KA0HCP, ex-KB4QAA Relocated to Ks. April 2019.
G3RZP
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« Reply #8 on: April 23, 2014, 03:19:05 AM »

In 1948, you could get a surplus BC625 4 channel crystal controlled 2m AM rig that would give about 10 watts or so output from a 832 pretty cheaply. You could even modify it to use a command transmitter as a VFO.  Trying to put 2m into what was basically a nice HF tx seems a strange approach to me.

Something I can never understand is where all these old rigs went to. Surely not all of them to landfill?
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KB4QAA
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« Reply #9 on: April 23, 2014, 11:41:11 AM »

Well, whatever you philosophy, The TBS-50 was still popular and selling well ten years later, into the late 50's. 
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KA0HCP, ex-KB4QAA Relocated to Ks. April 2019.
G3RZP
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« Reply #10 on: April 24, 2014, 03:48:10 AM »

I suspect they weren't much used on VHF. As a rig, they always look very nice to my mind and have the advantage for a boat anchor that they don't take up a lot of table space.
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W7VO
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« Reply #11 on: April 25, 2014, 12:13:11 PM »

The neatest thing for me that the the TBS-50s LOOK older than they are. Even though they are from the 50's, they can slide right next to a transmitter from the 30's and not look out of place. Simple and functional.

de Mike, W7VO
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W1BR
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« Reply #12 on: April 28, 2014, 08:04:10 AM »

In 1948, you could get a surplus BC625 4 channel crystal controlled 2m AM rig that would give about 10 watts or so output from a 832 pretty cheaply. You could even modify it to use a command transmitter as a VFO.  Trying to put 2m into what was basically a nice HF tx seems a strange approach to me.

Something I can never understand is where all these old rigs went to. Surely not all of them to landfill?

Considering frequency multiplication required in the 807 PA stage to reach 144 mc. I really would not to see the harmonic and sub harmonic  content in the output on a spectrum analyzer Roll Eyes Roll Eyes Roll Eyes
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KE0ZU
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« Reply #13 on: April 28, 2014, 04:19:39 PM »

Quote
Considering frequency multiplication required in the 807 PA stage to reach 144 mc. I really would not to see the harmonic and sub harmonic  content in the output on a spectrum analyzer Roll Eyes Roll Eyes Roll Eyes
Yep, I'd suspect its gonna look like the classic Comb generator. Grin   When I get it running I'll post a pic of the output.   Don't hold your breath though, its gonna be a while.
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Regards, Mike
https://mikeharrison.smugmug.com/
Pics and bold print are usually links.
G3RZP
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« Reply #14 on: April 29, 2014, 01:39:32 AM »

Bit like the old BC640 ground - air VHF tx. Described to me as 'causing TVI even when switched off!' The RAF were still using some in the early 1950s and as VHF TV started in the UK, they caused problems.
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