500 series preamps are a pretty popular item for discussion around here. I thought I would start a thread on the racks that hold these units. I'm going to give it a go as a first shot and as new or better information comes in I will edit this first post to try and make a pretty comprehensive list of options.

I just got a wack of toys from a friend working from his work! Apparently they were throwing there old junk.

Among the stuff was a fully functional HP 3580A!
As well about 20 hammond 804 xfmrs and some other audio looking xfmrs

Anyone know this:
2362-8101 EHEC81 I?131

This thread is response to a point Boswell brought forward in the thread
http://recording.org/diy-pro-audio-forum/49120-smt-does-size-matter.html

http://www.davehilldesigns.com/smt_resistror_distortion_rev1.pdf

I use 0603 and larger. I was told 0603 in feedback was a bad idea. Which seems to support Mr. Hills results.

Anyone have any opinions?

I just found this . file:///C:/Documents%20and%20Settings/Link/My%20Documents/Downloads/PCBlyt-home-ent-audio%252bEMC%252bT-100818%20(1).pdf

Lots of good stuff in there.

Hi, i'm a student of electronics and i'm thinking about making some audio gear... i thought about moog filters because they look pretty simple to create, here's my question, has anybody made one of those? i mean 901A, 901B, 901C, 902 or 904C? which one sounds best?

Hi all,

I'm in the process of installing a new line mixer at the local grade school and I'm having a ...challenge... figuring out how to connect it to the old existing amp (which still runs perfectly.

I have an old Groove Tubes 6TM mic with the PS1 Vacuum tube power supply. The mic end looks like the Groove Tubes EC7 cable in that it has a 7-pin connector. The power supply end looks like an 9-pin ADAT sync connector almost like a vga computer display connector. I am in need of the pin out configuration so that I can build one or a source to purchase one.

I recently had the pleasure of working on a Trident S40 by John Oram. First let me say the unit was well constructed for repair and modifications. It came apart in about 1 minute, and the circuit board was clearly labeled and easy to work on. The unit had a grounding issue with the XLR input, but otherwise fully functional.

Can someone tell me what the destination points are for each of the rows on the underside
Tuchel Connectors labelled as follows: