ampage
Tube Amps / Music Electronics
For current discussions, please visit Music Electronics Forum.

ampage archive

Vintage threads from the first ten years

Search for:  Mode:  

Hammond 1620 OT


 :
8/6/1999 1:01 PM
Mook
Hammond 1620 OT
I've got a Hammond 1620 OT, which is rated for 20 watts (6,600 ohm  
 
CT primary).  
 
 
 
I'm going to use it for a pair of 6V6s, but what whould happen if I used  
 
a pair of EL34s, 6L6s, or KT66s?  
 
 
 
(I understand the wiring differences between EL34 and 6L6 types, so  
 
no need to comment on that. Also, my PT filament current rating is 5A,  
 
so, I'm safe in that area)  
 
 
 
Could this small OT take to load? From a tone/sound and safety  
 
perspective, do I have anything to worry about?  
 
 
 
 
 
Thanks,  
 
Mook
 
Today
ampage
archive
And now, a word from our sponsors:


 
8/8/1999 4:16 AM
Bruce

I've got a Hammond 1620 OT, which is rated for 20 watts (6,600 ohm  
 
CT primary).  
 
I'm going to use it for a pair of 6V6s, but what whould happen if I used  
 
a pair of EL34s, 6L6s, or KT66s?  
 
 
 
*** It will work fine if and even better if you use cathode bias. ***  
 
 
 
Could this small OT take to load? From a tone/sound and safety  
 
perspective, do I have anything to worry about?  
 
 
 
*** Not really... for guitar work, using a pair of 6L6 tubes, the 1620 is close to 35w-40w Pro Reverb in power handling. ***  
 
 
 
Bruce  
 
 
 
 
8/9/1999 1:33 PM
Steve K
I've used a 1615 OT in a modified Deluxe circuit  
 
and pounded it with more current than the Hammond  
 
rep mentioned it could safely handle using 2 el34's  
 
and after several hours it still is fine. I went  
 
back to 6v6's as I prefer them in this amp. But  
 
with fixed bias, the el34's really sang with that  
 
OT. I know I was pushing it to the limit though  
 
but it shows how tough those little Hammond  
 
trannys are...  
 
Steve K
 

  Page 1 of 1