All tube direct box

[ivegotmono]

I've got some spare preamp tubes and transformers laying around. Anyone have any reccomendations for a schematic for a DIY all tube (except PS?) direct box for recording guitars and/or vocals. The HiZ guitar input would be the more important of the two.
Thanks

 

[Geek]

Hi,

One transformerless DI box, coming up... use one section of this:
http://geek.scorpiorising.ca/GeeK_ZonE/index.php?topic=2476.msg27847#msg27847

Cheers!

 

[ivegotmono]

WOW Thanks Geek.
If I need a XLR balanced output I would assume that I could use a 1:1 transformer in the typical arrangement. Any better ideas for XLR out. Also I assume I could substitute 50K or 100K audio taper pot for the 47K resisto at the input for trim??
Thanks
Steve

 

[Geek]

Hi Steve,

WOW Thanks Geek.
If I need a XLR balanced output I would assume that I could use a 1:1 transformer in the typical arrangement.

You bet!

I've even tested that.

Any better ideas for XLR out.

Not without a lot of uneeded circuitry. Transformer is simply the best for balanced.

Also I assume I could substitute 50K or 100K audio taper pot for the 47K resisto at the input for trim??

Yup! But if this is for a guitar, make sure the pot is 500K or larger.

If you build the circuit, make sure you get the sections correct on the ECC88 (pins 6, 7, 8 = U1; 1, 2, 3 = U2), because of the Vh-k breakdown is different for the sections.

Cheers!