Ampex Balanced Matching Input transformer pn 4580200-01.

Shielded, sealed input transformers for Ampex Model AG-400 series machines. Cosmetic condition is Good. All tested for continuity.

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$89.00

These Ampex plug-in transformers are used for the input electronics of Ampex tape recorders, specifically Models AG-440B, AG-445B, along with the 500 and 600 series. They were used in place of a dummy plug to provide a Balanced Input to the Record/Play Electronics. They use a standard Keyed Octal plug with gold plated pins. These are sealed, shielded transformers and this batch was dated from 1967 thru 1969.

Transformer 4580200-01 is a balanced-bridging transformer with unity gain and an input impedance of 20KΩ.

The specifications are as follows:

PRIMARY: 20KΩ
SECONDARY: 20KΩ
Frequency Response: 20Hz--20KHz. +/- 1db
Distortion <.2% @ 30Hz.
Mu-Metal shielding
Electrostatic shield

Notes on Ampex plug-in Transformers

The Ampex AG series machines were shipped with dummy plugs (4030034-30) that set the input for a direct recording with unbalanced signals. The dummy plugs jumpered pins 3 and 4, pins 6 and 7 and pins 2 and 8 (for ground & plug shield).

In order to use a balanced signal for recording, input transformers were installed in place of the supplied dummy plugs.

This transformer, pn 4580200-01 is a balanced-bridging transformer with unity gain and an input impedance of 20KΩ.

(The 4580200-02, is an alternate Matching transformer that can be used in place of the -01 unit, and it provides about 14dB gain with an input impedance of 600Ω.)

On these transformers, pins 4 and 8 are the primary signal input, pins 3 and 2 are the output and pin 1 is the case shield.