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For 6AS7G tube rollers here ..... - Page 85

post #1261 of 3799

They were one of the main tube makers so they most likely made their own 6AS7G.

They used RK, CK and QK for brand identification.

 

The 6AS7G is mentioned in  their Special Purpose Tube Characteristics booklet.

post #1262 of 3799
Quote:
Originally Posted by ctrlshift View Post

These went for $530 US... I thought it would go a lot higher. Whoever won it could prob make a nice profit selling them in pairs
http://www.ebay.com/itm/281319226103?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Quote:
Originally Posted by Xenophon View Post

See above:  they're not 5998's and the seller knew so imo.  I thought it fishy because he didn't show a closeup of the plates (far as I know all TS 5998 have the 'domino' plate structure.  So I sent a mail and asked, fort back a fuzzy response about it being some kind of military batch 5998-->sounded like BS to me.  Ultra here thinks the 5998 and TS designation have been added later and he's forgotten more about these tubes than most here know about 'em.  And I don't have them on my screen right now but there was something off with the date codes (number starting wit 322, the last digit indicates the shift number and I recall seeing something was off there).

If a deal looks too good to be true...I pity the poor guy who purchased them.
Looks like Old Guy Radio is back at it again with a lot of 8 6as7s marked as 5998s.
fleabay.
post #1263 of 3799

His prices are always on the high side ;-)

post #1264 of 3799
That's the third lot of 8 '5998's old_guy_radiola is selling since I posted about it. He must have a whole crate of them...
post #1265 of 3799

I have 2 WE 421A's bought from diff vendors, both look bit different. One is a slightly bigger with chrome top, with prominent dimples on the plates & the other one has clear top with barely noticeable dimples. Is this difference because they were made in Diff factories ?

 

 

 

 

 

 

 

 

 

 

post #1266 of 3799

I didn't find anything regarding a physical change in the tube but going by the date codes the tube with less visible marking was produced in week 39 of 1951 whereas the other dates from week 13 of 1958 so that's quite a difference.  Is the 'less dimpled' one really as matte looking as the pics on my screen make it appear, looks almost coated with some powder, which -together- with the clear top and possibly almost absent/absorbed getter would make me worried.  It tests and sounds ok I presume?  

 

If it sounds and works ok then I'd chalk it down to  modification in the manufacturing method over the years.

post #1267 of 3799
Quote:
Originally Posted by Xenophon View Post
 

 Is the 'less dimpled' one really as matte looking as the pics on my screen make it appear, looks almost coated with some powder, which -together- with the clear top and possibly almost absent/absorbed getter would make me worried.  It tests and sounds ok I presume?  

 

If it sounds and works ok then I'd chalk it down to  modification in the manufacturing method over the years.

No the matte look is just bad photography but there are some flakes of powder or something stuck to the glass. Both sound good.

post #1268 of 3799
Quote:
Originally Posted by punit View Post
 

No the matte look is just bad photography but there are some flakes of powder or something stuck to the glass. Both sound good.

 

Do they sound different? That is, would you feel comfortable using them together in the same amp as power tubes?

post #1269 of 3799
I have already tried them on WA22. There is a slight diff. It is not immediately apparent, you have to listen for it. But it's there, one side has slightly more treble extension.
post #1270 of 3799
Quote:
Originally Posted by punit View Post

I have already tried them on WA22. There is a slight diff. It is not immediately apparent, you have to listen for it. But it's there, one side has slightly more treble extension.

 

Given the differences in internal construction, I would expect them to sound different.... Thanks for the info.

post #1271 of 3799
Quote:
Originally Posted by punit View Post

I have already tried them on WA22. There is a slight diff. It is not immediately apparent, you have to listen for it. But it's there, one side has slightly more treble extension.

 

 

i was about to mention.

 

similar thing on the 422A rectifier, and well now i guess its also on very few 421A's

 

I thought all 421A where like 5998 with the darker plates, in your pic, one of them is the older grey plate tube. im guessing maybe only really early 421'a had it or something. 

 

for comparison, on the 422A rectifier, the lighter grey plate is from the 50s and sounds slightly better than the 60s version. they're almost identical, but i think the grey plate looks cooler, has more of a cool ghostly vintage look to it (the glass was nicer with an eerie light golden tint to it and it lacked the little getters the regular 422a had).

 

maybe the 421A also has this similarity where the older grey plate version is slightly better. in any case, if i still had a WA2, i'd totally be into the older 421A, maybe thats the REAL version that sounds the best, cause the regular dark plate 421A is pretty much identical to the 5998, except the glass is slightly fatter, but sound-wise, 100% identical.


Edited by Dubstep Girl - 5/31/14 at 3:55pm
post #1272 of 3799

My first American Made 6AS7G.The vendor sent me a RCA instead of RAYTHEON.:(

The tube is RCA and the box is RAYTHEON what a guy but then again both item start with R to him it's close enough.:biggrin: 


Edited by i luvmusic 2 - 6/2/14 at 1:20pm
post #1273 of 3799

I remember asking here before if RAYTHEON made their own tubes and someone said to take a picture when i received them now I'am pretty sure this is not RAYTHEON.

post #1274 of 3799
Nope. Not Raytheon. The Raytheon 6AS7G tubes I had all said Raytheon on them.

The Sylvania is a very nice tube BTW.
post #1275 of 3799
Quote:
Originally Posted by Skylab View Post

Nope. Not Raytheon. The Raytheon 6AS7G tubes I had all said Raytheon on them.

The Sylvania is a very nice tube BTW.

 

The Raytheon, Westinghouse and Sylvania 6AS7 I see on eBay all look very similar to the RCA. What features do you look for to distinguish them?

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