5E7 output T @ 2.6ohm with 2 6V6's

[nokaster]

maybe this is a stupid question, but am I correct in assuming that i can use a 5E7 output T @ 2.6ohm secundary, intended for 2 6L6's;

with 2 6V6's, resulting in a secundary impedance of 5.2 ohms?
(which i can get with 3 16ohm speakers in parallel)

i've got a bandmaster cabinet for 3 10 inch speakers and a mercury 5E7 OPT at a very good price, but i'm considering building with 6V6's because i like the 6V6 tone and the lesser volume than 6L6's...

circuits could be 5E7 but with 6V6's or 5E9A with the nice addition of a tube tremolo.

i'm also alreay looking at speakers... so any input on 10 inchers is welcome!
i love the 10" weber signatures in the first amp (a 5F1 with tremolo in a 5E7 cabinet and 3 10" also), but i'm thinking about something a little more expensive this time...

thx for your input!

[erndawg]

am I correct in assuming that i can use a 5E7 output T @ 2.6ohm secundary, intended for 2 6L6's;

with 2 6V6's, resulting in a secundary impedance of 5.2 ohms?
(which i can get with 3 16ohm speakers in parallel)

You are correct. By the way, that small OT used in original 5E7 Bandmasters is actually 4 ohms. So, it was always mismatched to the 2.6 ohm speaker load. Your math is correct in considering the approximate plate load of the 6V6s combined with the impedance matching of the OT. You will get an approximate 8 ohm transformation going into a 5.6 ohm load - so you will have the same mismatch as a 6L6 Bandmaster. That mismatch adds some character to the 5E7's tone, and distinguishes it from the 5F4 Super which is nearly identical. Sounds like a fun project.

[MWJB]

If you use a 4K:4ohm (typical Fender primary impedance into 4ohms) and use 3x10" at 16ohms each in parallel (5.3ohms total) then your OT will end up as 5.3K:5.3ohms, due to reflected impedances...close enough to run 6L6 OR 6V6 without rewiring speakers/adjusting loads.

[txstrat]

May I suggest the JJ 6V6s?
They can handle the voltages of a 6L6 while maintaining the 6V6 sound.
I accidentally biased a pair @ 40ma each with no redplating. Great stuff.

[tubeswell]

FWIW I built a 5G9 clone (fixed bias amp with LTP inverter) last year that used a pair of (JJ)6V6s with a 5k primary zed through the OT. Sounds hunky-dory.

[nokaster]

thanx for the replies!

i already have the dedicated 2.6 ohm bandmaster transformer from MM.
i guess i'll build a tremolux with 6V6's and use 3 16 ohm speakers in parallel for 5.2 ohms.

now i have to decide between 5E9-A or 5G9...
has anyone here payed both?
i guess the 5G9 is cleaner, while the 5E9-A is in the 5E3 ballpark?

[tubeswell]

(well naturally) I'd vote for a 5G9 (with a G12M 20Wer). The combination of LTP inverter and fixed bias is awesome with the bias vary trem.

[nokaster]

it seems like the better option since i'm not to sure i like the early break up of a 5E3.

i am going to get 3 10 inch speakers though...