diy channel strips [pics]

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alexc

Well-known member
Joined
Sep 21, 2004
Messages
2,571
Location
Hobart
Hi Guys

Thought I'd post some pics of a couple of my mongrel builds.
I wanted to use up my spare parts and indulge my need to cram
lots of stuff in boxes...

First up, a 'vintage channel' - it is a vero preamp section with ba282 and country man style di with mic and line traffos (jlm and stancor) all switched feeding a pultec filter section and another ba283 for make up gain then onto a g1176 with no line amp, using a neve line driver to a big old output traffo. Also uses a led display for output level and cheap VU for gain reduction. And it has hard bypass of each section.

vintage_chn1.jpg

vintage_chn_in1.jpg


Next in the making is the MkII version - 3ru, very little wiring and relay bypass. Uses JLM DI, JLM 99V with 990 doa to pultec to 990 make up and then to g1176 using it's line amp as well as a parallel gsrpp make up amp for good measure. Led board for outlevel and real VU meter for GR. Uses lundahl and haufe traffos - 5 all up.

vintage_chn2.jpg


Finally, a drip la2a and sowter iron with a knocked together 2 valve fender style guitar preamp and tone controls and high gain and direct out on stancor iron as well as a parallel hi gain out on stancor iron. Plus 2 mci vu meters for out level and gain reduction.

la2a_chn2.jpg

la2a_chn1.jpg


The vintage channel is a little noisier than I'd like at about -58dBu
at high GR settings but sounds pretty damn fine on my tele. The
1176 sounds just like it should - spongy and sustaining with some
subtle crunch reminiscent of great solid state amps of the 70s.

The LA2A channel is dead quiet and the guitar preamp is pretty
amazing on both the tele and the jbass. Of course the compression is
stunningly smooth.

I predict the MKII channel will be the flagship of my builds. Thise haufe
traffos sound pretty good and for the price - I use them everywhere.

Of course, all my units feature my characteristic lack of attention to
detail!

As always, thanks to all the people who make it all possible. Mr Gyraf, Joe Malone, Fabio, Gustav, Drip, Roger Foote and *me* :green:

Happy diy :thumb:
 
Cool stuff! Veroboard is the way to go!
Where are you getting these haufe trafos?
 
ummm ok... and here I am struggling with some 312s...  ::)

nice work man... my brain starts to overload just looking at it.

Where do you get those haufe trafos?
 
Get the Haufe traffos from German Ebay http://stores.ebay.com/MediaVideoAudio.

I get the ones with the most and biggest largest traffos - usually distribution cards.
These also have DOA cards often, which are fun to play with.

They are a bit of a 'mystery transformer buy' kind of thing, but I find I get
usually 1:1 or 1:2 coils at impedance 200ohms-400ohms (guestimate from measure and spec
sheets of similar). I haven't had any problems for them in 1176/pultec/312 type of apps.

PS - this is not an exact science. I try them out. If they sound good, don;t fry anything and
scope good for voltages, freq and ringing, I use them.

They are 'hi-fi' - sound convincing and with no loss of bottom.
 

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