ImPasse Preamplifier

[jackinnj]

Here are the Sowter 3575C and Cinemag CMLI-15 transformer's overlapped -- Pin 7 of the Cinemag connects to a shield which isn't present on the Sowter, and Pin 2 connects to an optional second shield.

Unless there are any corrections, I am going with this layout --

[wirewiggler]

looks good to me as always nice work. Are you going to provide any parts for it, particularly the pc mounted tube sockets? If not let me know where I can locate them. Payed for transformer time to start scrounging for parts.

Thanks
Bill

[luvdunhill]

Jack:

I can help look at the board, if you'd like... it would handy if the entire board was at that resolution, but it's understandable if you don't want to post it to protect SY's wishes. Feel free to e-mail me the file if you'd like another pair of eyes on it.

[jackinnj]

I just sent the files to the board house before dinner -- I'm keeping my fingers crossed as this is the first time I have used them.

I inverted the colors, which may make it a bit more readable -- I've allowed for WIMA 0.47u/400V and Vishay 0.47u/630V on the output side.

Hopefully, the 4 slots allow the boards to be snapped apart if needs be (or you can use metal shears to separate). I have allowed the use of Molex 0.100" headers and cables to attach the potentiometers, etc.

I think it takes 10 days:

[SY]

My "wishes" are to get my hands on one of these boards!

Nothing to protect, I do this stuff for fun.

[Guiness]

Jack,

what is the process to get on the "list" for one of these bad boys?

[jackinnj]

Originally posted by SY
My "wishes" are to get my hands on one of these boards!

Nothing to protect, I do this stuff for fun.

Originally posted by Guiness
Jack,

what is the process to get on the "list" for one of these bad boys?

Let's see how they work first. I will get rid of them at cost.

I'm going to mount my transformers on spacers so that they can be removed easily (if necessary). There are no traces for the heaters, you'll have to hard wire them. I did put in a couple of vias for the bypass on the 6SN7.

Anyone want to comment on the applicability of the 12V version of the 6SN7 -- j'ai beaucoup de ces animaux.

[SY]

S'il vous plait, veuillez les envoyer a moi!

[gl]

Hi Jack,

For the breakaway slots it is best to have the two slots closest to the edges of the board actually exit the edges of the board. It produces a much cleaner result on the corners and the cleanup of the edge is quick and easy.

The board house may get in touch and suggest this or they may go ahead and set it up this way anyway.

Graeme

[jackinnj]

Originally posted by gl
Hi Jack,

For the breakaway slots it is best to have the two slots closest to the edges of the board actually exit the edges of the board. It produces a much cleaner result on the corners and the cleanup of the edge is quick and easy.

The board house may get in touch and suggest this or they may go ahead and set it up this way anyway.

Graeme

I can mill them here to bring the slot out into the open.

the board house had a couple of questions which I guess are resolved so we'll see. I have gotten all my parts and transformers and am anxious to get going. this is the first time I am using a board house outside the US.