SEE attachement.

Walt Cates, WD0GOF

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A majority of acceptance is not proof of correctness.

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From: [email protected] <[email protected]> on behalf of Keith <kd4avp@...>
Sent: Tuesday, April 8, 2025 9:54 PM
To: [email protected] <[email protected]>
Subject: [HallicraftersRadios] Hallicrafters S-107 Very First version...Not the MK1

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Working to restore a S-107. This is the first version with the 6SC7 tube before they went to the 12AX7.

I can only find a schematic for the MK1 & 2 which use the 12AX7.

Someone has done a half hearted attempt at recapping this one and did the can cap conversion underneath.

While doing this, they took some liberties with the 680 and 1000 ohm (R37 & 38 I think) and replaced them with 2 of the 680 ohm 1 watt resistors.

But also found what I think is a 1 ohm carbon resistor between the rectifier and the 6K6GT.

I am not certain that is even correct or needed.

Have yet to find it on the MK2 schematic but I admit my ability to follow drawings is slow.

Could possible be overlooking it and not realize.

Would anyone by chance have a schematic of the S107 based on the 6SC7 tube??

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