Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Ampex Plug-In Mic Pre 96440-02 Schematic and Pics
Ampex Plug-In Mic Pre 96440-02 Schematic and Pics
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 2nd November 2019, 05:01 PM   #1
jlaber is offline jlaber  United States
diyAudio Member
 
Join Date: Feb 2011
Default Ampex Plug-In Mic Pre 96440-02 Schematic and Pics

Schematic and photos of an Ampex 96440-02 Microphone Preamplifier plugin unit are posted here:


Ampex Mic Pre Plugin 96440-02 | Flickr




Click the image to open in full size.

This preamp uses an unmarked Beyer Dynamic input transformer and RCA Nuvistor tubes, housed in an octal-based aluminum can enclosure. It looks similar to the 96440-04 preamp for the Ampex 354, but it uses different tubes and is not listed as an option on the Ampex literature I found for the 354.


DC voltage supply resistor/capacitor comes from the 354 schematic, assuming this model preamp is compatible.
  Reply With Quote
Old 3rd November 2019, 07:09 PM   #2
indianajo is offline indianajo  United States
diyAudio Member
 
indianajo's Avatar
 
Join Date: Jan 2010
Location: Jeffersonville, Indiana USA
Well, ****. flickr won't let me download this and there is no diyaudio image.
I have a collection of 7895 nuvistor tubes in boxes from some ancient trash bin. Now if I could find a socket that would connect to them . . .
I wonder if these were the style tubes that were in the air-burst artillery shells and prox anti-aircraft rounds at the end of WWII? A wartime secret never revealed.
__________________
Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300
  Reply With Quote
Old 3rd November 2019, 07:47 PM   #3
PRR is offline PRR  United States
diyAudio Member
 
PRR's Avatar
 
Join Date: Jun 2003
Location: Maine USA
Yes, Flikyer is a pain.

Consumer Nuvistors appeared in the late 1950s specifically for low-snow high-gain VHF reception for better fringe-area reception (and sales). Yes, they may have been based on military research. I've never seen that documented.

I've seen the same can but with transistors. I suspect it was originally a can for optional input transformers. Stuffing TO-18 was tight; stuffing tubes is amazing (and hot!).
Attached Images
File Type: jpg 49001314961_02d686210b_z.jpg (128.0 KB, 35 views)
  Reply With Quote
Old 7th November 2019, 10:30 PM   #4
jlaber is offline jlaber  United States
diyAudio Member
 
Join Date: Feb 2011
Sorry, I don't often have much time to post, and hadn't taken the time to look up how to attach files. They are attached here.
Attached Images
File Type: jpg IMG_4058.jpg (506.1 KB, 35 views)
File Type: jpg IMG_4059.JPG (810.2 KB, 31 views)
File Type: jpg IMG_4060.JPG (669.4 KB, 23 views)
File Type: jpg IMG_4061.JPG (897.6 KB, 22 views)
File Type: jpg IMG_4062.JPG (765.8 KB, 23 views)
File Type: jpg IMG_4063.JPG (778.7 KB, 25 views)
  Reply With Quote
Old 8th November 2019, 09:44 AM   #5
petertub is online now petertub  Sweden
diyAudio Member
 
Join Date: Jul 2015
Location: gothenburg,sweden
Ampex Plug-In Mic Pre 96440-02 Schematic and Pics
This was an impressively tight build !
Any opinions about it's quality as microphone amp ? Most if not all the parts are possible to source today..
__________________
My home is at www.tubular-well.se
  Reply With Quote
Old 8th November 2019, 04:21 PM   #6
jlaber is offline jlaber  United States
diyAudio Member
 
Join Date: Feb 2011
Quote:
Originally Posted by petertub View Post
This was an impressively tight build !
Any opinions about it's quality as microphone amp ? Most if not all the parts are possible to source today..



I haven't tried it yet. I don't have a deck to plug it into, so I reverse engineered it in order to rack it up with power supply, line amp and attenuators. I've been curious for decades about nuvistors in audio applications. Back in the day, the RCA TVs with nuvistor front ends said "New Vista Color" on them.
  Reply With Quote

Reply


Ampex Plug-In Mic Pre 96440-02 Schematic and PicsHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Push-Pull 6L6 or EL34 Schematic, Mullard 5-20 vs. Ampex 6516 force of 1/2 Tubes / Valves 35 23rd October 2019 11:22 PM
Radial phase plug vs concentric ring phase plug sean19 Multi-Way 17 7th April 2016 11:20 PM
Suggestion for plug-in enhancement or new plug-in Brisso57 miniDSP 1 8th November 2010 06:59 AM
chip burn-out when plug-in or plug-out DVD signal lines xujing79 Class D 3 3rd August 2010 06:07 AM
Ampex 354 reel to reel and Ampex MX-35 mixer for sale on ebay megaladonman Swap Meet 2 13th February 2005 10:01 PM


New To Site? Need Help?

All times are GMT. The time now is 08:49 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki