What else can you do with submini's?

[Ripthorn]

Well, I bought myself a few 6011's for a distortion pedal/preamp build, but I bought a lot of 4 and my project only takes 2.  So I have two extras and I was wondering what else could be done with these and if anyone has any references for the projects.  I am thinking something not overdrive/distortion related.  I  know that there are tube tremolos and tube compressors.  Anything else?  If there are submini power tubes, then I might consider doing a classic amp design but with subminis.  But what I think would be really awesome is a submini version of summit's TLA-50 (too bad I can't find any schems for that).

So my question basically is what other projects are there besides distortions that submini's could be put into and are there any submini power tubes?

[frequencycentral]

The 5672 I use is a pentode power amplifier: http://frank.pocnet.net/sheets/127/5/5672.pdf

There are other submini pentode power amplifiers with higher output on this list, they seem rare though: http://pw2.netcom.com/~wa2ise/radios/penciltubes.html

Data sheets: http://frank.pocnet.net/

Vibrato and phasing should be possible too: http://www.ax84.com/bbs/index.php?id=292675

[Ripthorn]

So could one use the 5672 in some sort of push/pull configuration?  I would want them to run relatively clean and use the 6111's to provide the distortion.

I guess I am just wanting to see what others have done or thought about. I have read most of your stuff, Rick, and that is some very impressive tubeness going on.

[frequencycentral]

So could one use the 5672 in some sort of push/pull configuration?  I would want them to run relatively clean and use the 6111's to provide the distortion.

I guess I am just wanting to see what others have done or thought about. I have read most of your stuff, Rick, and that is some very impressive tubeness going on.

My next breadboard amp experiment will be exactly that, two 5672 in push/pull config, 6111 as preamp/cathodyne phase inverter, Hammond 125A O/T.

Just have a look at some P/P amp schematics. Here's one: http://www.jjs.at/electronic/class_ab_subminiature.html There are loads more about if you look.

The downside of the 5672 is it's maximum voltage limit, which is quite low. With tubes volts=volume.

I also have some 7327 dual triodes, which can take nicely high voltage, so I'm also going to try a P/P using them and a variation of this P/S: http://www.ledsales.com.au/kits/nixie_supply.pdf

Subminis are just tubes, no more no less - I guess you could take just about any amp schematic and build it with subminis.

[Ripthorn]

Would you just replace a schematic's original tube with the submini or would component changes be necessary?  Let's assume that the power supply is not a concern in this context, so dealing just with the audio path, really.  I have seen at ampgarage that people have done a submini version of the trainwreck express and that interests me, as does a tube preamp of some sort (mic, bass, whatever).

[frequencycentral]

Got a breadboard? The best thing you can do is breadboard an amp design using subminis and see how it sounds. Then start tweaking. You might not have to change anything. But change a few things anyway just to see what difference it makes.

A breadboard is THE best investment you will make in electronics. I don't build anything without breadboarding it first. Subminis are so easy to bradboard with too.

[Ripthorn]

I do have a breadboard, but a somewhat small one, but it might accomodate a decent amp.  I did notice that the leads on the 6111's are particularly nice.  Also, for submini's, are the pinouts as viewed from the bottom or the top?

[frequencycentral]

You should get a bigger one. I do all my work on this:



Here's Dano's Subcaster with easy read pinout:

[Ripthorn]

That is one slick looking breadboard.  I may have to get myself something like that.  Dano's layout illustrates it perfectly.