Can I put 6L6GC set on st70 to replace EL34 set ?
Do I have to adjust biaset ? same 1.56V or different ?
Will they sound differently ?
thanks...
Do I have to adjust biaset ? same 1.56V or different ?
Will they sound differently ?
thanks...
+3
Dogstar
wildiowa
wantech
7 posters
6L6GC to replace EL34 on st70
wantech- Posts : 8
Join date : 2017-09-26
wildiowa- Posts : 237
Join date : 2012-03-19
I have two EL34's from an old Marshall amp on one side of my ST70 and two 6L6GCs on the other side....not ideal, will catch much flak here for that....but it will work. not sure on the bias etc. But I think they are pretty much interchangeable. Isn't it essentially the EL34 is a British tube, the other a US??
Dogstar- Posts : 361
Join date : 2014-06-23
Did you try one of each on each channel rather than one pair on one channel and the other pair on the other channel? Seems like that may actually balance the sound better.
GP49- Posts : 792
Join date : 2009-04-30
Location : East of the sun and west of the moon
6L6GC is not the USA equivalent to EL34.
6CA7 is.
6L6GC is a lower-power tube, typically used in ultralinear amplifiers of 15-20 watts output power. It can be used in a Dynaco Stereo 70 if the idle current (referred to by most as "bias") is adjusted to the appropriate range for the tube.
6CA7 is.
6L6GC is a lower-power tube, typically used in ultralinear amplifiers of 15-20 watts output power. It can be used in a Dynaco Stereo 70 if the idle current (referred to by most as "bias") is adjusted to the appropriate range for the tube.
peterh- Posts : 1836
Join date : 2012-12-25
Location : gothenburg, sweden
GP49 wrote:6L6GC is not the USA equivalent to EL34.
6CA7 is.
6L6GC is a lower-power tube, typically used in ultralinear amplifiers of 15-20 watts output power. It can be used in a Dynaco Stereo 70 if the idle current (referred to by most as "bias") is adjusted to the appropriate range for the tube.
6L6 is a lower power tube. 6L6GC is higher rated then EL34 ( but downward equivalent,
you can replace a 6L6 tube with a 6L6GC but not the other way around)
6L6(GC) and 6CA7 are both beam-tetrodes, EL34 pentod. But they will all work fine in
a ST-70
Guest- Guest
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Last edited by PeterCapo on Thu Dec 03, 2020 11:44 pm; edited 1 time in total
wildiowa- Posts : 237
Join date : 2012-03-19
I read somewhere that the "GC" designation was merely a "glass case" sidebar and there is little difference in performance...but of course, that was off the internet!! So there are discernible, and distinct differences between the two? I come from the guitar amp world of 6L6 and EL34's...essentially, Fender vs Marshall. If you want to see a debate between these two tubes check out a tube guitar amp blog....the debate rages.
peterh- Posts : 1836
Join date : 2012-12-25
Location : gothenburg, sweden
wildiowa wrote:I read somewhere that the "GC" designation was merely a "glass case" sidebar and there is little difference in performance...but of course, that was off the internet!! So there are discernible, and distinct differences between the two? I come from the guitar amp world of 6L6 and EL34's...essentially, Fender vs Marshall. If you want to see a debate between these two tubes check out a tube guitar amp blog....the debate rages.
Note : 'G' stands for glass, 'C' version C ( 30w plate limit)
I'll quote :
http://www.tdpri.com/threads/6l6-6l6g-6l6gc-whats-the-difference.710286/
The 6L6 is a metal tube, and generally isn't used in gutiar amplifiers, it's rated at 360V max and 19W max plate dissipation. The 6L6G and 6L6GB are rated 360V max and 19W max plate dissipation. The 6L6GC is rated 500V max and 30W max plate dissipation. If you're running a typical Fender amp with their insanely high B+ you want 6L6GCs.
See https://www.thegearpage.net/board/index.php?threads/6l6-vs-6l6gc-interchangable.561680/
And of course, applicable tube data sheets
Peter W.- Posts : 1351
Join date : 2016-08-07
Location : Melrose Park, PA
WARNING: Some (not all) ST70s, especially vintage devices, use one of the output socket pin terminals as a junction - for the EL34, there are no pins in that position. Using a metal tube in that socket may cause all sorts of havoc. BE EXCEEDINGLY CAREFUL!
Otherwise a glass 6L6, or even a glass 5881 can be a very mellifluous, if lower power, option in these amps. Please used them in pairs, and please bias according to the need of the tube. I also want to repeat that there is NO reason electrically to use all-four the same type of output tubes.
However, when rolling tubes at that level, making sure that the sockets are tight becomes an necessary habit at each change.
Otherwise a glass 6L6, or even a glass 5881 can be a very mellifluous, if lower power, option in these amps. Please used them in pairs, and please bias according to the need of the tube. I also want to repeat that there is NO reason electrically to use all-four the same type of output tubes.
However, when rolling tubes at that level, making sure that the sockets are tight becomes an necessary habit at each change.
Tubes4ever- Posts : 167
Join date : 2015-07-14
Location : Star, Idaho
wantech wrote:Can I put 6L6GC set on st70 to replace EL34 set ?
Do I have to adjust biaset ? same 1.56V or different ?
Will they sound differently ?
thanks...
Yes you can use 6L6GC in an ST70. Bias them the same as you would the EL34.
I use them in my ST70 because I like the more pronounced highs as compared to EL34s. 6L6GCs have more "Chime" than EL34s.
As others have noted, use 6L6GC not any previous version as they are not rated for the voltages present on the ST70.
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