A proposal for Doug and the Forum

[kagliostro]

Why, here in the forum, we don't develop a pair of FXLoop and a Relay unit  like this ?

(relay unit will be an improvement on the existing Doug relay unit that maintains the utility of the standard Doug's relay board for many uses, not a substitution for the existing one)

This unit uses a very small 6112 double triode tube

https://www.tube-town.net/ttstore/product_info.php/language/en/info/p5992_Kit-Tube-FX-Loop-6112.html

https://www.tube-town.net/info/datenblaetter/kits/tt-fxloop6112.pdf

This unit uses the small LND150 Mosfet

http://www.tube-town.net/ttstore/product_info.php/info/p5973_Kit-Serieller-FX-Loop-LND150.html

https://www.tube-town.net/info/datenblaetter/kits/tt-fxlooplnd150.pdf

This relays unit incorporates jack intake

http://www.tube-town.net/ttstore/product_info.php/info/p5910_Kit-Doppel-Relais-Umschalter--6-V.html

http://www.tube-town.net/info/datenblaetter/kits/kit-chsw2-6.pdf

I don't say to copy the circuits as thy are, I say we can draw/develop our version

and when finish, If Doug is interested, he can put the PCB on his catalog

K

[moonbird]

Sounds like a good plan to me. I would like to see more use of sub-mini tubes. Seems they would be a very size-efficient way to add features to existing amps. I would like to add a sub-mini-based reverb and/or tremelo board(s) to k's list as well. There is an excellent and comparatively low cost supplier of *many* different sub-mini tubes on the bay these days. Not sure if I can give his name tho.

[moonbird]

Subminis might also be a good way to add controllable OD circuitry into traditional tube amp designs WITHOUT injecting those "nasty" SS parts - just a thought!! 

[sdp1234]

I'd love to build a submini effects loop... problem is that to date none of my amps have had effects loops and I haven't worked with submini's.  I'm getting ready to build a couple October studio type amps (from the AX84 site) .  Wanted to try the effects loop but I'm not sure there is enough room.  A submini or mosfet effects loop may be easier to fit.  Tried looking around but haven't found much information.

[DummyLoad]

sub-miniatures cool and all BUT, problem is there are no new production tubes and sockets are very scarce. you can rig to work an 8 pin DIP IC socket but that is sub-optimal or, you solder direct to a PCB (shudder!). there are some soviet military NOS sub-mini's floating around on ebay that claim to be 6111 and 6112 subs. so, what then when those dry up? just some things to think about...

respectfully, 

--pete 

[kagliostro]

Some time ago I've find this schematic that is claimed to be a good High Voltage SS FXLoop circuit



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About 6112 tube, Pete is right, but may be we can find an adequate 7 pin tube for that purpose

and the montage do in horizontal this way


K

[sdp1234]

Im pretty slow but i think ill try to pot this together on a small turret board.

[sdp1234]

In the ss fx that is shown,  what is the purpose of the switches and pre out? 

[kagliostro]

The pre out is what it is

an exit to an external Power Amp

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The switch select the desired level of signal

K

[sdp1234]

I've been looking for schematics and descriptions of ss effects loops in a effort to learn and prepare to build and test one.  There is one listed about half way down this thread that looks a bit simpler for starters.  Thoughts?

http://ax84.com/bbs/index.php?area=-1

[sluckey]

Could you be more specific?

[sdp1234]

Sorry Sluckey,

I've been pretty swamped with non amp stuff.  I'm interested in a bunch of stuff but due to my lack of time I've become lazy with my posts.  I'll give this basic loop a try and follow-up with reasonable questions based on the results.



Thanks

[mrsmash23]

Hello everybody!

SDP1234: Can you confirm that mosfet fx loop you posted is working?

Or did anyone else try it? Optimal B+? Is there different fx loop circuit that has been verified?
Thank you in advance! Hope this post is not dead!

[sdp1234]

I haven't done anything amp related (other than a few repairs for friends) in quite a while.  I have a long list to get started on but work and life in general has kept me more than busy.  Sorry