Vintage ADM 2780 Console Input Modules Discrete Mic Preamp Transformers IN/OUT

Description

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Dual ADM 2780/780 Console Input Module  Discrete Mic Preamp Transformers IN/OUT
Racked   ADM 2780/780 Discrete
opamp Mic Preamp,  with  Transformers in and out
Internal PS 110V or 220 Volt Option.
One channel of discrete mic preamp from late 70's early 1980's 780/2780 series ADM consoles .
Discrete Opamp  Based Mic preamp Plug and Play ADM-2780/780 console input module .
Racked and refurbished ready to use.
Transformer balanced in and out.
Completely refurbished and ready for studio use.
Plug and Play Ready to ship...Allow a few extra days to ship if 220V is required .
ADM 202  discrete opamp.
ADM 2780/780  channel  of Console input Module .
Dual outputs discrete and stock ADM , both active simultaneously.
The stock output has a IC after the discrete opamp and is capacitor coupled 80db output.
The discrete output the IC is bypassed and the output is  transformer coupled with a max gain of about 58db.
Internal Power Supply 110 or 220 Volt 220 Volt option requires additional shipping time.
Gain control for setting the gain of the mic pre and separate line in gain settings
Mic Gain control adjust the gain of the amplifier from -30db  to -80db  input, in stock ADM output ( discrete opamp and IC ) and from -30db to -58db in Discrete opamp only out , transformer balanced output.
( no IC in the circuit totally discrete opamp  transformer balanced in and out )
Two separate outputs discrete out and ADM stock out.
( see photo of the rear panel)
Two separate inputs one when using a mic and a separate line input.
Can be used when  you want to bring a line input into the module
( gain make up for a passive summing box or passive EQ)
The gain switch at the far left of the module has a off position ,. a line in +10db to -20db and mic in
-30db  to -70db ( only goes to -58db when using the discrete only output.)
They can not be used at the same time .
48V Phantom,  Pad  ,     switches using the GRP and Solo push button switches on the module
These 2780/780 modules are excellent mic preamps.
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A Bi-polar +/- 20V power supply is included in the enclosure with an internal toroidal 25V transformer .
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See my Ebay Store for more VPA-ADM RACKED AND READY FOR STUDIO USE MIC PRES/  EQUALIZERS/ HI-PASS LOW PASS FILTERS/NOISE GATES  AND COMPRESSORS.
Available  empty racks to put your ADM modules in .
Custom all discrete Mic preamps   ADM 1668   ,  ADM-2668 and ADM 668   2  to  8   channel 1 and 2 space racks available .
In my store Dual 2780/1540 ADM Channel Strips . ADM-1541/1540 EQs.
ADM 320/1320 Compressors. ADM 310/1310 Noise Gates .
ADM 1551 Low Pass High Pass filters.
The ADM 1540 EQs , 320/1320 Compressors, 310/1310 Noise Gates and 1541 Filters all use the same pin outs
and can be combined in any combination in our 1 space Racks .
All ADM racked and ready to use ADM Systems are guaranteed for 30days.
All return shipping is the customers responsibility.
I have been getting a lot of questions about the ADM booster cards
so here is a little more info on the above products.
The 2668 is part of the 780/2780 series console booster cards. from late 1970's through the Mid 80's
The 1668 is part of the 770 series consoles booster cards.from early 70's to late 70's.
The discrete opamp in the 1668 is very much like a 2520 API ( I had a ADM TV 32 that had all 2520's replacing ADM opamps) the input transformer is the same on both cards . The output transformers are different.
To add more confusion the ADM 668 cards are all discrete (5 transistors) a UTC O-12 ( same as an 1176) and a custom output transformer.
These were in late 1960's to very early 1970's consoles the 700 series console..
All of these ADM booster cards ( like API-312 cards) are about 55db of gain except the 668 which is all transistor 40db of gain. ( no discrete opamp)
The 780/2780 input modules have an IC after the discrete opamp to get the extra 20db.
The 668 card all transistor (friends say they are Neve like ?) O-12 input transformer same as 1176
The 1668 card UTC O-8  input transformer>discrete opamp>output transformer.
The 2668 card UTC O-8 input> later discrete opamp> different output transformer.
The 2780 has the same input Xfrm same discrete opamp ( as 2668) from here it differs as it goes into a 4 transistor class a output driver to the same output transformer as the 2668..
The 1922 Card has the same output transformer driven by the same 4 transistor output circuit but it has a 5534 IC instead of the discrete opamp.
with the same input transformer as the 2668.
This card is a candidate to put a dip socket to discrete opamp adapter in and make it the discrete section of the 2780 ( or at least make it the way we mod the 2780 to be all discrete ( eliminates the additional +20db IC gain.)
The Compressors and the Noise Gates were designed to be on the buss . So they are rare buss compressors as most ADM consoles were only 4 buss plus the stereo buss. Not all boards had them installed, very rare option on the ADM consoles.
Buyer will pay ALL shipping costs, including insurance, packing and shipping materials. I personally do not ship, all sales FOB Umatilla FL.
This means for pick up in Umatilla Florida or I will arrange shipping for you through a shipping service.
The shipping service Iship4U  will charge a small  handling fee in addition to actual shipping costs.
Sold as is.
If you have questions please email or call and I will try to answer them.
Please read the terms and conditions below. Please contact me BEFORE bidding if you have any questions.
Shipping takes place after the funds are credited to my checking  account, NOT upon PayPal notification .
This may add a few days before I ship.
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Please send email with questions before bidding. The Final bid is binding. If You are the High Bidder, you agree to send the funds as stated. No Warranty is expressed or implied, Sold "as-is" and all Sales Final, unless otherwise stated in the description above.Shipping is non refundable . Items authorized for return must be returned in the same packing and in the same condition as send . All items 10% restocking fee.  Thank You for bidding and good luck...
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