Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by stu2, Apr 5, 2008.
The 5881 is just a military spec 6L6 anyway...more heavy duty.
They were used in B-52s also known as a 6L6WGB. FWIW they're what Larry Carlton uses in his Dumbles.
Heavy duty how? I know they were rated for a lower max voltage than a 6L6GC.
Don't know. That's the reason for the post. Looks like a question for Mike @ KCA.
I think it depends on the manufacturer. Soldano has used them for quite some time in thier punishing SLO 100 series. I tend to go a little easier on them then the sturdier versions of 6L6's tho. The Sovtek 5881WXT's are also considered 6L6's which makes things a bit confusing.
From the KCA website:
Arguably, JAN tubes were never specifically designed to yield strong tonal performance. However, since many of these examples are identical to commercial tubes and others are merely mechanically "beefed up" versions, youd have to assume that many JAN tube types sound very good. There are probably some JAN types that are sonically inferior but this is largely a matter of taste and opinion. A classic example of a fantastic guitar tube that could also be found in B-52 bombers is the Tung Sol 5881 (a.k.a. 6L6WGB), which was standard issue in many of Fenders 1950s tweed amplifiers.
This tube was first developed by TungSol for the US Military. They are in short stubby glass envelopes. There is no difference between the 6L6WGB or the 5881, they are the same tube. The 5881 has a maximum plate rating of 360 volts at 23 watts and a maximum screen rating of 270 volts at 3 watts. DO NOT USE IN AMPS CALLING FOR 6L6GC's. They will likely melt down and damage your amp.
I was also under the impression the 5881 had thicker mica spacers,heavier support rods, gold plated grids and were made to be more resistant to shock for military communication purposes?
Sorry, my mistake. More resistant.
OTM - just a little correction to your useful chart: the 5932 was also called 6L6WGA.
I did not know that there was a difference between 5881 and 6L6WGB!
Many Tung Sols sport both numbers.
Yes, I know that.
OTM - Are the higher-wattage specs from the later-production Canadian GE and Sylvania versions of the 5881?
Kinda makes you think that to Tung Sol they were the same tube
Of course! This I know. What I'm trying to get at is where Old Tele Man got the increased-wattage specs for the 5881. I'm hoping for his reply.
Well that didn't answer my question as to why you have two different entries for the 5881 and 6L6WGB. As far as I know, they are one and the same.
I did note, however, that the output rating of both the 5932 and 5881 are shown as 26.5W for class AB1, whereas your chart shows the rating for the 5932 at 19W.
Yes, I was concurring with your wonderment