[whirlwind]

Great info! How about Raytheon 6AS7G - ever tried those?

I have not tried them, but the ones that I have seen look like these and i think that these would be RCA 6AS7G

 

[gibosi]

To the best of my knowledge, the only American companies that manufactured the 6AS7G were RCA and Chatham. So tubes labeled Raytheon, Sylvania and GE are rebranded RCA or Chatham. And this also goes for Tung-Sol. TS never manufactured the 6AS7G. TS simply purchased Chatham in the mid-1950's, but production of the 6AS7G continued in the original Chatham factory, so these later TS 6AS7G are essentially Chatham.

 

[L0rdGwyn]

My pair of Tung Sol/Chatham 6AS7G for reference, copper rods, bottom getter only.

 

[mordy]

To the best of my knowledge, the only American companies that manufactured the 6AS7G were RCA and Chatham. So tubes labeled Raytheon, Sylvania and GE are rebranded RCA or Chatham. And this also goes for Tung-Sol. TS never manufactured the 6AS7G. TS simply purchased Chatham in the mid-1950's, but production of the 6AS7G continued in the original Chatham factory, so these later TS 6AS7G are essentially Chatham.

Hi gibosi,
I think that there are Tung Sol 6AS7G tubes labeled as 6520, perhaps in two variants - with regular plates and dimpled plates. Don't know if the dimpled plates are the same as the 5998.
And then there are IBM labeled ones with a lot of 9s in the designation numbers.

 

[gibosi]

First, the TS 6520 and the 5998 were manufactured by Chatham, before and after TS acquired them. The true 6520 is a tweaked 6AS7G. Those with diamond plates are actually 5998. And yes, 3002399 is the IBM part number for the 5998. Evidently, IBM purchased these in such large quantities that TS/Chatham labeled them with IBM's inventory number before packing and shipment.

 

[mordy]

Let's see if you can figure out what this is - a pair of 6AS7G tubes Made in England, labeled as Amperex with Tektronix stickers on the boxes.

https://www.ebay.com/itm/Qty-2-Ampe...=true&nordt=true&rt=nc&_trksid=p2047675.l2557

 

[mordy]

Nice to hear from you Rob.
Early production RCA black plates are one of my favourite 6AS7G.
They are not as good as the MOV 6AS7G but they are a great tubes.

Hi rosgr63,
Which driver tubes do you like to pair with the RCA 6AS7G in your Glenn amp?

 

[Phantaminum]

Let's see if you can figure out what this is - a pair of 6AS7G tubes Made in England, labeled as Amperex with Tektronix stickers on the boxes.

https://www.ebay.com/itm/Qty-2-Amperex-shoulder-type-6AS7G-NIB-NOS-dual-triode-tube-England-Tektronix-/333164852258?hash=item4d922c3422:g:CMsAAOSwUNRcuzgN&nma=true&si=pC%2BcpeA6VhPu6%2F8qiWP%2Fpiqa0W0%3D&orig_cvip=true&nordt=true&rt=nc&_trksid=p2047675.l2557

Those are some beautiful relabeled Russian 6H13Cs, lol!

 

[mordy]

Those are some beautiful relabeled Russian 6H13Cs, lol!

Those are some beautiful relabeled Russian 6H13Cs, lol!

Yep, correct. The giveaway is the inverted saucer getter cup (right side in middle picture.) For some reason there were very few manufacturers of the 6AS7 type tubes - RCA and Tung Sol in the US, GEC in Gt Britain, and Svetlana in Russia, regardless of brand names. Then there are Chinese variants - 6N5PJ etc but nobody seems to like those.
PS. A Google Image search turned up a Japanese NEC 6AS7. Don't know anybody who has them them, but should sound good:

Lately fake 6AS7 tubes are showing up under multiple brands with very realistic looking aged boxes - they are all Russian made. Some unscrupulous sellers are asking hundreds of dollars for some of these tubes....

 

[leftside]

Lately fake 6AS7 tubes are showing up under multiple brands with very realistic looking aged boxes - they are all Russian made. Some unscrupulous sellers are asking hundreds of dollars for some of these tubes....

Post the links Mordy. Name and shame them.

 

[rosgr63]

Hi rosgr63,
Which driver tubes do you like to pair with the RCA 6AS7G in your Glenn amp?

Hi Mordy,

I've been using my RCA's with lots of different drivers and 3 of my 6 OTL's (GOTL, 2 SinglePower) and never kept a record.
I'm afraid I'm not disciplined at all, sorry I can't be of much help.

 

[mordy]

Tried to find SinglePower amps on Google but could not find them. But I found this 3W tube amp for $95 shipped:

https://www.ebay.com/itm/APPJ-Assem...Stereo-Power-Amp-Board-HiFi-DIY-/282415070393
No headphone jack.....but can be assembled without soldering.

 

[mordy]

OK - now I found the SinglePower amps: MPX3 and Supra. It appears to me that the company closed down.
Looks like the amps only use 6SN7 tubes (3x and 6x).

 

[rosgr63]

They had different configurations some used 6SN7 others 6SN7 and 6AS7G/5998 and so on.
They don't sound bad at all actually, I have 3 of them.

 

[whirlwind]

Hi Mordy,

I've been using my RCA's with lots of different drivers and 3 of my 6 OTL's (GOTL, 2 SinglePower) and never kept a record.
I'm afraid I'm not disciplined at all, sorry I can't be of much help.

6 OTL's

At first I thought...why does he have six OTL's...then it hit me, because he has thousands of tubes