Has anyone put a TMB circuit into a 5f1 circuit?

[bakerlite]

I am doing alot of semi acoustic club gigs and need a stage amp that isnt too loud and has a bit of tuneability in the tone area - I may well be better suited to doing a single channell ab763 type build but on the of chance that someone has fused a tmb circuit with a 5f1 se output section I would be very interested to hear.
I found a lovely project by DR.KT88 its a single ended kt88 build.
I would love to have some sort of eq with this - mid is essential in fact maybe 3 position switches to to account for my two basses I use, one is an old fender P bass  and the other is an active resonator semi acoustic bass - they require very very different eq's  so a switchable tone cap  ( a la the old SVT) for each of  tmb would be a god send.
I am just looking for something to give a bit of stage prescence - we are talking small quiet gigs so I am thinking an 18watt SE with an efficient cab will be fine.
its small for bass I know but thats whats required.

[HotBluePlates]

... on the of chance that someone has fused a tmb circuit with a 5f1 se output section I would be very interested to hear. ...

Yes. Fender did in the blackface Champ.

Of course, the midrange is a fixed value (at 15kΩ) but you could replace that resistor with a pot of any value that suits you. The smaller the pot, the more midrange dip there is at its highest setting.

[phsyconoodler]

mid is essential in fact maybe 3 position switches to to account for my two basses I use, one is an old fender P bass  and the other is an active resonator semi acoustic bass

Ok,a 5F1 is a guitar amp,not a bass amp in the first place,so you definitely need an EQ section.You should be looking at one channel of a Bassman circuit like the AA165 or Something along those lines.
 An AB763 would be fine,except it's slope resistor is best suited to guitar.You need to alter it so bass frequencies will be accentuated.
 Remember,for bass you need quite a bit more output power to be heard over guitars,so think about making at least a 25 watt bass amp.A single channel AB763,push-pull wiith a pair of 6V6's and an altered slope resistor,into whatever bass cab you have in mind.

[PRR]

That OT (hard to read) appears to be an 11 pound lump. And rather over-engineered for stage.

With push-pull, you could do similar bass power with 3 or 4 pounds of iron. Hammond 1620 or 1650F.

And after trying to tease a 6550 above 13 honest watts (16 stage-amp watts), I think push-pull is MUCH easier to dial-in for max power.

Also MUCH less B+ ripple trouble. SE lets the buzz right through, P-P can eat real garbage and not let much to the speaker. This will usually allow dropping the choke (another 4 pounds).

Pair of EL84 or good 6V6 fix-bias at 400V 100mA (same supply) does 18W-23W easy.

Yes, it is two more bottles. (Another power tube and something to invert.) Non-trival complication.

However you can get a spare 6V6 or EL84 on a rainy Friday night in almost any town big enough to support a tavern. Even Hoffman isn't stocking 6550/KT88 regularly.

And push-pull amps *may* limp-out the night with one power bottle dead. Not great, but beats not getting paid.

[bakerlite]

you guys are right as always - I just had that silly notion that one kt88 would be ok I was dreaming a bit I guess - and yes the PP will be quieter (i cannot abide noise).

hmm... scratches chin
If I am looking at a full tone stack I wouldn't really want anything other than my tried and tested svt ampeg preamp that I run into a power amp for big gigs. tone to die for and versatility without being over complicated. - though not according to kevin o'connor

What i would SERIOUSLY love to build would be that svt preamp (minus the nasty comb eq which i never switch on) run into push pull output section.

I personally love the sounds of KT88 for bass - however i do not know if this is simply because I do not have the experience under my belt of using other amp configs with different output tubes for bass so it could be an incorrect conclusion that to my ears kt88 sound nicer -

I have the svt preamp schematic is there anyone who can help run it into a push pull output section?? It would be a leap to far in design and theory for me to accomplish that part?? Its a ridiculous ask I know - but if anyone is feeling ridiculously helpful...

I could guarantee that I not only would build it but play the hell out of it!

[sluckey]

Why not just build a power amp that you like and just plug your existing SVT preamp into that?

[bakerlite]

There is no doubt I could, but that preamp is in a 5U flightcase which is  stuffed pretty well;  It also sometimes doesn't get home the same time with me so for the small local gigs I am doing a lot of it would be good to have a smaller setup for just that. 

[PRR]

> love the sounds of KT88 for bass

I submit that the sound of push-pull differs from single-ended.

While SE has been favored for some killer guitar recording, bass generally wants a less tasty/nasty sound as it nears breakup.

> the svt preamp schematic is there anyone who can help run it into a push pull output section??

Plagiarize.

Here's a good-OLD Bassman plan that went obsolete when bassists zoomed to 40W, 100W, 300W, ?,000Watt amps. Still a fine thing when you favor large tubes and small output power. Can fit KT88 just as well as the originals. (In fact if you strap pin 8 to pin 1 with 470K, you can run 6L6, 6L6GC, EL34, KT88/6550 and even 7027 at your pleasure.)

Since it takes 22 Watts just to light the (KT88/6550/EL34) heaters, and these same bottles can do 60-100 Watts (with far bigger iron!), it isn't the most efficient design. But often that's not as important as flavor and simplicity.

[clyde]

Why not directly tie P1 to P8 a la EL34? 

[HotBluePlates]

Why not directly tie P1 to P8 a la EL34? 

It was an answer PRR came up with a couple years ago for someone who wanted to be able to plug any octal output tube in the socket, including the 7027.

But the 7027 has the screen grid connected to pin 1, where other common octals don't. The 470kΩ resistor allows this tube to be safely plugged into a socket that also handles the other octal tubes.

See this thread for more information.