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Trivia on Amateur Amps that had sweep tubes!?!?

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  #9  
Old 09-15-2011, 04:37 PM
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Well someone challenged me on that issue on another site. Because I was referring to an Amp that was clearly marketed towards illegal CB user's but was tagged with a plate and sticker as a 10m/6m Amateur Amp. So I have been keeping an eye out for any legit Amateur marketed gear that had them in it. I am young 37 years old and am still taking class's at the Red Cross with my son to become Licensed Amateurs! So I had no idea where to look and was not going to dig for it on purpose but just kept and I out. So when I came across it I figured I would post it. The Technician that challenged me on that is at least 20-30 years older then me so odd that he had such selective memory about this!

Yes, i am a big believer that parts have no idea where their going to end up and who they will be marketed to! So really it comes down to a design by design basis. I say that because I have two such amps and one is an absolutely beautifully executed single band 40 year old HF amp with sweep tubes. The other unit is a nightmare of poor design, poor execution and all kinds of band aid's inside to try and cover for poor design!

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  #10  
Old 09-15-2011, 05:19 PM
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Quote:
Originally Posted by Kamikaze View Post
And Drake sold a lot more with sweep tubes. Drake was considered top quality.
True the Drake was top of the line in the day as were Yaesu's and I believe these guys started getting away from the sweep tube to satisfy the hard core hammy as the cb craze got into full swing and with the availability of cheap sweeps to make illegal cb amps the big hf rigs switched from those to keep customer relations up this the hammy's.

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Old 09-15-2011, 08:36 PM
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Quote:
Originally Posted by Captain Kilowatt View Post
I don't know about "everybody" thinking that way. there were more than you think. Ameritron had the AL-84 that had four 6JM6 tubes in it. Sweep tubes were even used in a Yaesu amp, I forget the model FL-2500 maybe, used 6KD6's and the FL-1000 used 6JS6A's. Yaesu used sweep tubes in the finals of the FT-101 series, 6JE6 I believe. There were a lot of legit stuff using sweep tubes.
Close!

6JS6C in the FT101.

Later zed series got swapped for the stout 6146B, a proper RF amp tube.
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Old 09-16-2011, 02:15 AM
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The switch from Sweep Tubes had nothing to do with PR and the Ham's standards...it had everything to do with the changes in advancing technology of transistors and solid state.
The Amateur community still relishes and embraces the sweep tubes IMO Have you seen the prices on the Drake TR-4C (W)(rit) versions lately...through the roof
I love those rigs T4XB/R4B none better!
My SWAN 700S certainly drifts a helluva lot less than most of the Galaxy's /Ranger CB's... I've seen on the bench!
What would we "Hammy's" be using if it was....
If the CB world uses it! Then we don't want it!
OH I'm sorry you use PILLS....We use transistors!
All the Best
BJ
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Old 09-16-2011, 05:17 AM
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Quote:
Originally Posted by office888 View Post
Close!

6JS6C in the FT101.

Later zed series got swapped for the stout 6146B, a proper RF amp tube.
Quote:
Originally Posted by BJ radionut View Post
The switch from Sweep Tubes had nothing to do with PR and the Ham's standards...it had everything to do with the changes in advancing technology of transistors and solid state.
The Amateur community still relishes and embraces the sweep tubes IMO Have you seen the prices on the Drake TR-4C (W)(rit) versions lately...through the roof
I love those rigs T4XB/R4B none better!
My SWAN 700S certainly drifts a helluva lot less than most of the Galaxy's /Ranger CB's... I've seen on the bench!
What would we "Hammy's" be using if it was....
If the CB world uses it! Then we don't want it!
OH I'm sorry you use PILLS....We use transistors!
All the Best
BJ
Is the ft101-z a hybrid? I wasn't aware it was.

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Old 09-16-2011, 12:48 PM
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Quote:
Originally Posted by mackmobile43 View Post
Is the ft101-z a hybrid? I wasn't aware it was.
Yep!

ZD was a 12BY7A driver with a 6146A final.

My Heathkit DX40 has a 6146A as the final...great little tube.

The FT301-series was their first all solid state rigs.
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  #15  
Old 09-16-2011, 02:13 PM
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Another radio with sweep tubes was the Yaesu FTdx-400/401 that had 6KD6's in the finals.
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  #16  
Old 09-17-2011, 03:54 AM
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Amateur rigs went from sweep tubes to 6146s most likely due to perceived cheapness of sweep tubes verses the 6146 being a real rf tube whatever that means. The 6146 is a refinement of the 6L6 and is a very nice class C rf tube.

Of course the idea holds no water and the 6146 is actually a horrible linear amplifier tube.

Fortunately excellent designs can clean up otherwise poor performers. The old TS-830 is still one of the best ham rigs ever made and it used 2 6146s. Inverse feedback to the rescue.

An improvement was made with the Yea-hoo FT-102 using 3 6146s with enough feedback to keep things clean. In this case performance was really better than a pair of sweep tubes.

If older plastic radios were driven totally by engineering instead of marketing crap they would have used 6550s for finals.

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