5F6a importance of output configuration

[Baltar]

Moved to Technical section

[Baltar]

looks like my post is gone, so once more..

Hi again,

i'd like to try a 5f6a bassman in 6v6 configuration.
i thought about lowering voltage by using a 5y3.
due to 6k6:2r trannies are rare i'd use a deluxe reverb-ot
i still have in stock, which would require to wire the
speakers in series/parallel config to 8r.

what do you think - is it worth a try, or would the
amount of sonical influencing changes(tubes, tranny,
speaker response) result in something, that sounds very
different to a bassman?

cheers, B

[Jana]

I say go for it. If you can get the B+ to be around 350 to 380 or so, I think that will be a nice sounding amp. I think that would be a nice clubbing amp.

[Baltar]

thanks for you opinion.
i'm going to design the power supply-6l6-like and just alter
the rectifier, tubes, and ot. so in case i want to, the upgrade would
be easy.

[Structo]

Sorry about that Baltar, I didn't realize I had deleted your text.

I'm still learning which buttons to push.

[Baltar]

no worries thanks for moving

[renshen1957]

looks like my post is gone, so once more..

Hi again,

i'd like to try a 5f6a bassman in 6v6 configuration.
i thought about lowering voltage by using a 5y3.
due to 6k6:2r trannies are rare i'd use a deluxe reverb-ot
i still have in stock, which would require to wire the
speakers in series/parallel config to 8r.

what do you think - is it worth a try, or would the
amount of sonical influencing changes(tubes, tranny,
speaker response) result in something, that sounds very
different to a bassman?

cheers, B

Hi,

Some would worry more about the the B+ voltage than the Output Transformer. Kelley used a higher B+ and a circa 4k2 ohm OT on his 4 6V6 FACS. I have run 6V6 tubes in Bassman Transformers. You can run 6V6 tubes at a lower OT primary, your distortion will be higher, but in a guitar amp distortion is good.

Some of the newer 6V6 tubes can handle higher voltage.

Some things to consider as to rectifier tubes:

How much mA current the tube can handle.

Check out http://www.300guitars.com/articles/rect ... drop-chart

Regards,

Steve

[rp]

I'm still learning which buttons to push.

Tom, the wrong button could definitely be trouble! Here's a safety primer for you:

http://www.youtube.com/watch?v=6MMkiq8Kxis

Baltar, I'm thinking you want to keep the preamp voltages and PI close to 5F6A / JTM45 level for best sound, so you might have to play with the power string.

[tubeswell]

Well you could also do a 5F6A with 4 x 6V6 and then you could use the same OT.

As far as the PT goes, 2 x 6V6 should work well with a 5Y3G or a 5R4 from a 325-0-325VAC secondary

[Baltar]

@Steve
thanks a lot for the helpful link.
i like the electro harmonix 6v6 a lot and like to try those first in my build.
they are indeed voltage critical, other than eg jjs

@rp
good point, i will do

@tubeswell
don't tempt me
idea on one pair of 6v6 was to save some power and weight(smaller trans
if possible) still haven't decided for the pt yet, but am thinking of a 290dex