Allen AC 1331 Input Transformer

CJ · May 16, 2013

this is an input xfmr sent to me from Kid Squid,

it is for a transistor amp that has great sound,

it runs pretty flat and has great inductance specs,

we have the output here also which will be posted tomorrow.

here are some pics>

CJ · May 16, 2013

it uses the same bobbin as the Neve input iron, but only one as it is a single coil job,

CJ · May 16, 2013

this transformer is built up on a 3/8" fat stack of 187 EI,

CJ · May 16, 2013

here is an inductance vs frequency graph,

CJ · May 16, 2013

freq chart>

CJ · May 16, 2013

details:

ratio-1:2.3

Z- 600:3.2K

wound Pri-Sec

pri: 702T #38 fwd wind 7 layers hand wound

sec: 1615T #42 fwd wind 17 layers hand wound

DCR Pri- 58 ohms

DCR Sec- 257 ohms

Core- 187 EI 3/8" stack 0.006" thickness Alloy: 80 Ni Stacked:1 x 1

Pri Leads - Start-blu Finish-grn
Sec Leads- Start-brn Finish-org
Bobbin- black plastic ICM 218 B same as Neve inputs only no lead pins

Allen AC 1331 Input Transformer

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Allen AC 1331 Input Transformer

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