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USA made 6L6 identification

merkaba22

Member
Messages
1,165
Recently, I just pulled some of the 6L6s from the Fender Studio Bass amp (w/6 6L6's @200 watts) that I bought for the ocassional bassist who might drop by and see that they are US made -- I can just make out the silk screened: "PhillipsECG ja" made in USA "AKH".

They look like these: 6L6GC Sylvania Philips ECG STR-387 6L6-GC Tubes NOS/NIB that I see on eBay http://cgi.ebay.com/6L6GC-Sylvania-...ctronics_R2?hash=item56380402c7#ht_3431wt_941

Sorry for the iPhone pic quality, but can any body identify these tubes, tone distinction/comparison, etc.?

 
Messages
15
Slyvania "tall bottle" 6L6GC- probably 1970's because of the Phillips ECG label. These are the next best thing to the RCA "blackplate" 6L6GC, which is the supposed best sonically. They're not as common as the RCA, but they kill any modern Russian or Chinese tube.

Check the bottom of the page:
https://www.tubeworld.com/6l6gc.htm

I'll buy them off you if they work!
 

merkaba22

Member
Messages
1,165
Wow -- such great reviews! I was reading about the current offerings when something made get off my duff and see what was in there yesterday -- it's been a year since I bought it. How would you characterize these?

The SB uses 6 of these and 5 are good.

I have a newly acquired Concert (II) that they will go into. That leave another pair for reserve or for my Princeton Reverb II that has been modded to accept 6L6s.

Thanks again!
 
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merkaba22

Member
Messages
1,165
One more thought - I want to use them in my Concert (II) which presumably is biased for the Sovtek 5881WXT that came with when I bought it 10 days ago or so.

It will be until sometime next month that I can get the Concert in to be re-capped, etc and rebiased for the preferred Phillips 6L6's referenced above.

The question is whether the bias on these two different tubes are close enough for me to safely experiment with until I can take it in for a pro biasing?
 

MartyStrat54

Member
Messages
18
The 5881 aka a 6L6WGB is just a short bottled 6L6. You should have no problem with the bias, although a 6L6GC has a higher dissipation it will still put out the wattage of the 5881's.
 

merkaba22

Member
Messages
1,165
The 5881 aka a 6L6WGB is just a short bottled 6L6. You should have no problem with the bias, although a 6L6GC has a higher dissipation it will still put out the wattage of the 5881's.
That's kinda interesting because the 5881 extends about 4" from the chassis and the Phillips extends only 3.5" I know because I am trying to find out whether I can reduce the height of the head cab I building out of Concert (II) 2x10.
 

rockon1

Platinum Supporting Member
Messages
13,509
The 5881 aka a 6L6WGB is just a short bottled 6L6. You should have no problem with the bias, although a 6L6GC has a higher dissipation it will still put out the wattage of the 5881's.
The Sovtek "5881* isnt a real 5881. Much closer to a 6L6GC but not exactly. Bob
 

merkaba22

Member
Messages
1,165
So is a matched pair of Sylvania 5881 / 6L6WG with a current draw of 21.6 on a Hickok 539C for mutual conductance a good spec -- worth purchasing at a price for about $60 for a "matched pair"? And a good choice for my Concert (II)?
 

rockon1

Platinum Supporting Member
Messages
13,509
So is a matched pair of Sylvania 5881 / 6L6WG with a current draw of 21.6 on a Hickok 539C for mutual conductance a good spec -- worth purchasing at a price for about $60 for a "matched pair"? And a good choice for my Concert (II)?
The plate voltage may be too high for real 5881's-at least on paper. Bob
 

TweeDLX

Member
Messages
3,764
The plate voltage may be too high for real 5881's-at least on paper. Bob
Bob said it. My Concert II runs about 495-500VDC, and I wouldn't chance ruining a good set of tubes like that. I had some 6L6WGB's in it for a short while before pulling them for use in a lower voltage amp. I might use them in the Princeton II...

Mike
 

merkaba22

Member
Messages
1,165
Bob said it. My Concert II runs about 495-500VDC, and I wouldn't chance ruining a good set of tubes like that. I had some 6L6WGB's in it for a short while before pulling them for use in a lower voltage amp. I might use them in the Princeton II...

Mike
Great idea for the PR II!
 

jcs

Member
Messages
8,093
The Sylvania 5881/6l6wgb is still fairly abundant and can be bought in the $50-60 range easily.

The big bottle twin getter Sylvania 6l6gc is more rare and commands a higher price, i usually get $80-95 for any i sell and $150 or more for nos 7581 Sylvania (getting rare and very hard to find).
 




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