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Sylvania GB 5751

66.74.128.150

Posted on February 16, 2012 at 12:03:31
Pat S.
Audiophile

Posts: 347
Location: Westminster, CA
Joined: April 10, 2002
I have some Sylvania GB 5751 tubes with grey plates, 3 mica spacers and large, D-shaped getters. They have gold lettering and steel pins (not gold-plated). Are these 50's vintage or later? Also, how do they compare sonically to the 3MBP Sylvania 5751's that are going for so much $ these days?

RIP Dave Brubeck: 1920-2012

 

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RE: Sylvania GB 5751, posted on February 16, 2012 at 13:40:45
Mechans
Audiophile

Posts: 1225
Location: East Coast
Joined: May 23, 2004
TMGP 5751 GB by Sylvania I understand were produced circa. 1960. The 3 mica examples being earlier ca. late 50s and the 2 mica versions almost universally represented as early 60s.
I have no absolute proof or intimate knowledge of Sylvanias product releases. I only know what I have read here and elsewhere over the past decade or so, in this hobby. In addition, the dated Sylvania 5751s tubes that I own, bear this out, based mainly on packing, such as dates on the military JHS boxes. Triples are invariably 50s, in my collection but I am sure that some might have snuck under the wire and were produced slightly later. Some argue that the construction is definitive that is if it is TM it is 50s and DM that means 60s.
Sorry about the imprecision, but a recent request for "documented knowledge" got me thinking about some of my own preconceptions.

Steve

 

1960s if it's labeled GB5751, posted on February 16, 2012 at 23:54:06
Frihed89
Audiophile

Posts: 13983
Location: Copenhagen
Joined: March 21, 2005
I've never owned a pair.
Observe, before you think. Think before you open your yap. Act on the basis of experience.

 

RE: 1960s if it's labeled GB5751, posted on February 17, 2012 at 12:07:01
Pat S.
Audiophile

Posts: 347
Location: Westminster, CA
Joined: April 10, 2002
Yes. It is labeled (from top to bottom):
GB-5751
Sylvania
Gold Brand
Made in USA

The etched lettering says: "GB 5751"


RIP Dave Brubeck: 1920-2012

 

RE: 1960s if it's labeled GB5751, posted on February 18, 2012 at 11:21:29
Mendel
Audiophile

Posts: 687
Location: GTA
Joined: January 17, 2009
All Sylvania grey plate 5751's are from the 1960's--the blackplate versions were produced in the 1950's. They are both very good, but overall I think I prefer the TMGP like yours. The music seems more relaxed and more flowing. For some reason, the black plates sound more "electronic" in my amp. I know that is not very descriptive--not sure how else to put it. The grey plates sound more "real". I know others will disagree--it is very subjective. Enjoy your tubes, they are very good indeed.

 

RE: 1960s if it's labeled GB5751, posted on February 18, 2012 at 17:01:45
Pat S.
Audiophile

Posts: 347
Location: Westminster, CA
Joined: April 10, 2002
Thanks for the description, Mendel. I agree with you that they do have a relaxed and flowing sound. "Smooth" is another description that comes to mind. But, also, there is detail and transparency. I think I actually prefer these to the Raytheon BP windmill-getter 5751's. The Raytheon's sound a bit too forward in the upper mids/lower treble in my system and can be a little fatiguing after awhile. I know they are magical in other systems, though. As you said, it is all very subjective.

RIP Dave Brubeck: 1920-2012

 

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