DuMont PL 509?

[al2002]

Anyone know who made PL 509s for DuMont? Saw some FS on line, but am not sure about the maker and quality.

Photo attached.

Any info would be helpful. Thanks in advance.

 

[HollowState]

Based solely on the four square holes in the plate structure, I would guess early Sylvania. Dumont has been gone for many years so they are from the prime years of vintage tubes. If all the getters look good, I wouldn't be afraid of them.

 

[zacster]

I have an old DuMont TV in my house, all the tubes are still in it but none are labeled DuMont. The successor company to DuMont was MetroMedia, which ulitimately morphed into Fox, at least for broadcasting. I don't know what happened with the manufacturing, but I don't think they made any tubes. I have one DuMont tube, an 0C3, that is part of a mismatched quad of these. They all have different labels and all look exactly the same. It made me realize how little the label meant.

 

[Tubelab_com]

Based on the little fins on the ends of the plate, I would also say Sylvania.

 

[Kay Pirinha]

Agreed. I've got a bunch of Sylvania EL519's which look exactly the same.


Best regards!

 

[w5jag]

DuMont manufactured CRT's, I think. I remember advertisements for them. The tubes in DuMont boxes are premium parts, similar to Zenith branded parts. Zenith also made CRT'S.

Win W5JAG

 

[al2002]

Thanks for the replies HollowState, Tubelab_com and Kay Pirinha. I've ordered a set from the vendor, only a few were left.

 

[Kay Pirinha]

May I aks who your vendor is, and where he is located? Actually I have demands on PL509/519's, 'cause I've broken some in my amplifiers during move two weeks ago.

Best regards!

 

[al2002]

Ouch! That hurts.

The valves were listed by an ebay seller. He had only a handful left by the time I get to him. All sold now.

As you are based in Europe, I expect it would be easier for you to find these valve over there.

 

[artosalo]

Actually I have demands on PL509/519's,

Have you seen this ? Quite good offer and the seller is near you.

PL509 NOS – 1 Paar Tesla Rohren-Tubes-Valves matched (~40GK6 ~PL519) | eBay

 

[Kay Pirinha]

I'm glad that I've found a NOS PL 519 while I was cleaning up yesterday in the afternoon - my last one.

@artosalo: Thanks for this link ! Btw, have you seen this one? Apparently the short version when space is rather limited :-D.

Best regards!

 

[artosalo]

It seems to be a special feature and explains the special price 60£.
But maybe a bit difficult to sell

 

[mississippi]

Do they also sell the sockets for these "small" ones.

 

[al2002]

Looking around it does seem as though the PL509/519s and the 40kg6s are getting harder to find. Five years or so ago, they were fairly easy to get.

Anyone know why?

 

[petertub]

They have not been produced in 20+ years ..

 

[Kay Pirinha]

In Germany, the last tube equipped color TV's were produced until around 1972. Since then, sweep tubes were dedicated for replacement purposes only, and tube production completely ceased in 1975.

Fortunately I've designed the power transformers of my Circlotron monoblocks also for EL519's/6KG6A's, so I also may opt for these.

Best regards!

 

[petertub]

JJ makes a variant of PL509 with 6.3V filament ( EL509) and without the top connection
www.thetubestore.com - JJ EL509-S Audio Tubes

 

[Kay Pirinha]

Also did Svetlana with their EL509II.


Please note that both weren't/aren't true EL509's, 'cause they feature the International Octal base instead of Magnoval, with the same pinout as the 6L6 etc. Thus, both should have been christened EL3XX. The Svetlana tube actually was a repackaged 6P45S, also sharing it's huge (2.5A) heater current.


Best regards!

 

[al2002]

Thanks for the replies. For some reason I was not getting notifications of new posts to this thread.

Still looking on ebay I've noticed a trend where valves - not just 509s - are listed as NOS, but often the photos raise questions. As an example have a look at:

2 Matched NOS NIB Amperex 40KG6A PL509 Audio Research Power Amp Tubes,Holland | eBay

Do folks think these are really NOS? The glass envelopes seem to indicate otherwise.

 

[Kay Pirinha]

At least they do not show any signs of usage.

Best regards!