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"Complete" list of sweep tubes
"Complete" list of sweep tubes
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Old 30th January 2019, 07:49 PM   #61
pmillett is offline pmillett  United States
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Quote:
Originally Posted by Diabolical Artificer View Post
Not sure about the availability of the valve types in the USA but here in the UK the few I found on the list are more expensive than your average audio OP valve. They aren't available in any quantities either. Is there a supplier in Europe that anyone knows of, or a US supplier that sells for a competitive price? If not once shipping and customs/post office fees are taken into account, doesn't look like TV horizontal sweep valves offer much of a saving.

The more common types like PL509's, 6DQ6 etc have rocketed in price here in the UK recently and are getting harder to find at a good price.

Andy.
In the US, the sweep tubes that saw application in radio transmitters and linear amps (ham and CB, some commercial) can be crazy expensive everywhere. Usually you have to go to the odd heater voltages to get reasonable prices. 6LQ6 and it's relatives is a good example - $40 to $80 each. Even 31LQ6 is ~$20.

I don't know much about the European types. They may all be rare.

Pete
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Old 30th January 2019, 08:11 PM   #62
kodabmx is offline kodabmx  Canada
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"Complete" list of sweep tubes
Quote:
Originally Posted by pmillett View Post
The ratings in the table are all "Design Center" ratings...

Pete
Here's a side note that you may laugh at. When I was younger and first getting into tubes, I thought "Design Center" meant "The people in the design center chose these values" rather than the center of the design. We all have our "blond moments".
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Old 30th January 2019, 09:55 PM   #63
Tubelab_com is offline Tubelab_com  United States
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Quote:
Usually you have to go to the odd heater voltages to get reasonable prices. 6LQ6 and it's relatives is a good example
Some of those RF amplifiers used odd heater voltage sweep tubes too, especially the large illegal CB amps. The "Phantom 500" went through several iterations but the later versions ditched the filament transformer and wired 10 X 24LQ6's in series parallel directly across the 120 volt line.

Whoever designed that thing had no clue about RF impedance matching. It used 4 tubes in parallel to drive 6 tubes in parallel. One tube driving 9 would have made far more power. Squeezing 500 watts of RF from 6 tubes made for short tube life....that's why there are no 24LQ6's left in captivity.

Now if I were to make such a thing, it would use a 12BY7 to drive a 6146, which would drive a 4-400 for lots o watts.

Even GE got a piece of that action. They took the 6KD6, added a second cathode connection to pin 6 for better RF performance, and stuck a 13 volt heater inside for "mobile radio" use, and the 8950 was born. Try to find one of those today.

Similarly the "M2057" is an RF version, also with the 13 volt heater, of the 6LF6, one of the biggest sweep tubes around.
Attached Files
File Type: pdf 8950.pdf (210.0 KB, 26 views)
File Type: pdf M2057.pdf (381.5 KB, 33 views)
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Old 31st January 2019, 11:14 AM   #64
Kay Pirinha is offline Kay Pirinha  Germany
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Quote:
Originally Posted by pmillett View Post
I don't know much about the European types. They may all be rare.
So they are, 'cause they're out of production since decades now.
OTOH, a PL519 e.g. never was a cheap valve, especially when made by famous companies, such as ITT Lorenz, Telefunken, Siemens or Valvo. In the 1970ies, when they were widely available from new production, we had to pay about 20 Deutsche Mark per piece, which was about the same as USD 5 to 10 then.
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Old 21st October 2019, 01:15 AM   #65
smoking-amp is offline smoking-amp  United States
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Some errors I noticed in the 1st two lists:

There is no 12JV6, but there is 21JV6 and 33JV6

6GY5 Yes, does have a plate cap

6KN6 220V 2.88 Amp 42KN6 Yes

6LG6 Yes, does have a plate cap
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Old 21st October 2019, 08:25 AM   #66
petertub is offline petertub  Sweden
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"Complete" list of sweep tubes
JJ has EL509S with a modified base ( octal) and no top connection in current production.
It has the same electrical characteristics as PL509 except for the 6.3V filament
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Old 21st October 2019, 05:57 PM   #67
Kay Pirinha is offline Kay Pirinha  Germany
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Regarding the lists right at the thread start: PL505 had a 40V/0.3A series heater. It was the first European sweep tube especially designed for colour TV's. But TV's with this tube had a 2nd sweep tube, commonly a PL504 which did the sweep. The PL505 operated as HV source. But there were designs with two sweep tubes and one flyback transformer as well.
I'm not sure if there was a 6.3V/2A heated »EL505«.
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Old 23rd October 2019, 06:21 AM   #68
EL504 is offline EL504  Netherlands
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The PL508 is intended for vertical deflection so it should not be on the list.
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Old 23rd October 2019, 12:54 PM   #69
Kay Pirinha is offline Kay Pirinha  Germany
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Yes, this is also my understanding. But there's been consensus previously that a frame deflection tube also »sweeps«.
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