W
wooderson
New member
Can I put a set of EL34's in my Rebel 30? If so what should they be biased at?
Thank you.
Thank you.
D
danelectro
New member
Or how about 6L6's?
Jeff Hilligan
Well-known member
We have not verified either request. The 84's are a given they can take another tube. If you are going to try 34's or 6L6' bias to 60 mv. Making it 30 per tube. Any hotter you risk the transformer overheating.
AGAIN WE HAVE NOT TRIED THIS AND HAVE NO IDEA IF THERE ARE LONG TERM EFFECTS!
AGAIN WE HAVE NOT TRIED THIS AND HAVE NO IDEA IF THERE ARE LONG TERM EFFECTS!
R
RichR
New member
I just saw a Sweetwater ad, offering a Rebel 30 head, with some EL34 tubes bundled in. The statement in the ad is that the head comes with 6v6s, but can easily be adapted to EL34s. (Doesn't even mention the EL84s).
Does this mean I can swap in a pair of el34s in place of my 6v6 pair? Assuming a different bias setting for the el34s.
See the 'limited time offer:'
http://www.sweetwater.com/store/detail/Rebel30/
Follow up... As I research this, it sounds like the sockets are right, but at a minimum would require rewiring the sockets and maybe other mods. Seems like it would be a pretty serious mod effort, rather than "easily adapted." Is that Sweetwater ad a misprint?
Does this mean I can swap in a pair of el34s in place of my 6v6 pair? Assuming a different bias setting for the el34s.
See the 'limited time offer:'
http://www.sweetwater.com/store/detail/Rebel30/
Follow up... As I research this, it sounds like the sockets are right, but at a minimum would require rewiring the sockets and maybe other mods. Seems like it would be a pretty serious mod effort, rather than "easily adapted." Is that Sweetwater ad a misprint?
shimmilou
Member
I would have a couple of concerns about using EL34 in an amp designed for 6V6.
1) The heater current is approx .45 amps for one 6V6, and approx 1.6 amps for one EL34. So if you use EL34, the heater current would be more than three times the current of 6V6, less than 1 amp for two 6V6, and over 3 amps for two EL34. And, there are still two other EL84 output tubes pulling 1-1/2 amps of heater current (approx .75 amps each). So the total heater current would double from about 2-1/2 amps to just over 5 amps. Can the stock power trans handle that much more current?
2) The suppressor grid of an EL34 pentode is pin 1, and pin 1 is unused for 6V6. Sometimes the unused terminals on tube sockets in amps are used for connection points for other parts of the circuit, so I would want to be sure that pin 1 on the socket is connected to pin 8, or not connected to anything else (as a tetrode). If you only use a tetrode EL34, then this won't matter as the tetrode doesn't have the suppressor grid on pin 1.
I would check with Egnater and see what they say about using EL34 in a R30. Based on the above, I wouldn't, but maybe Sweetwater knows more about it than I do.....or, maybe a misprint.
Edit:
What's up with this adding links to our posts? I didn't make the word "Sweetwater" a link. "Shopping link added by Skimwords"?
1) The heater current is approx .45 amps for one 6V6, and approx 1.6 amps for one EL34. So if you use EL34, the heater current would be more than three times the current of 6V6, less than 1 amp for two 6V6, and over 3 amps for two EL34. And, there are still two other EL84 output tubes pulling 1-1/2 amps of heater current (approx .75 amps each). So the total heater current would double from about 2-1/2 amps to just over 5 amps. Can the stock power trans handle that much more current?
2) The suppressor grid of an EL34 pentode is pin 1, and pin 1 is unused for 6V6. Sometimes the unused terminals on tube sockets in amps are used for connection points for other parts of the circuit, so I would want to be sure that pin 1 on the socket is connected to pin 8, or not connected to anything else (as a tetrode). If you only use a tetrode EL34, then this won't matter as the tetrode doesn't have the suppressor grid on pin 1.
I would check with Egnater and see what they say about using EL34 in a R30. Based on the above, I wouldn't, but maybe Sweetwater knows more about it than I do.....or, maybe a misprint.
Edit:
What's up with this adding links to our posts? I didn't make the word "Sweetwater" a link. "Shopping link added by Skimwords"?