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Transformers For Using EL34's In A 5E3


 
2/11/2006 6:52 PM
Tim c. Transformers For Using EL34's In A 5E3
I found a power Transformer that will support the use of EL34's in a Deluxe style amp. Must the output transformer also support EL34's or does it matter?  
 
Tim C.
 
2/12/2006 4:24 AM
Chris/CMW amps
email

Hi Tim  
 
Yes, becuase of the higher plate- and G2-current. Try getting a B+ from around 350-375 Volts for cathode biased EL34s, primary impedance 3k4 - 6k8 for two EL34s will work.  
 
Hope this helps,  
 
Chris
 
2/12/2006 9:17 AM
Tim c.
So should I just use a Marshall 50 watt OT? If not, what is a good recommendation for a tranny that has the specs you mentioned?  
 
Thanks,  
Tim
 
2/12/2006 11:51 AM
Al Lang
email

I think you would be fine with a 30 watt OT for EL34's, you won't get 30 watts out of EL34's in a 5E3 design, probably about 25 or so, if that. Allen Amps has a nice 30 watt OT. But you'll need higher rating PT to run EL34's. Allen has a deluxe heavy duty PT that's perfect for 6L6s, and EL 34's. I bought them both for $130. Bruce probably has some good iron too.  
 
Al
 
2/12/2006 11:54 AM
Al Lang
email

Additional info:  
 
You'll also have to use 3 watt grid resistors 750 to 1K and ground pin eight of El34's.  
 
Al
 
2/12/2006 1:53 PM
Bruce /Mission Amps
email

[QUOTE]Additional info:  
 
You'll also have to use 3 watt grid resistors 750 to 1K and ground pin eight of El34's.  
 
Al[/QUOTE]Oops... Don't ground pin 8.... that's a good way to blow a pair of tubes.  
If building the amp with suitable trannys for EL34s, just ground pin 1 or connect 8 and 1 together.  
 
Bruce
 
2/12/2006 4:39 PM
Al Lang
email

Sorry, I meant to say ground pin 1, glad you caught my error  
 
Al
 
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