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Hallicrafters S-107 Very First version...Not the MK1

Keith All Messages By This Member #32124 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??
waltcates All Messages By This Member #32125 开云体育 SEE attachement. Walt Cates, WD0GOF ? A majority of acceptance is not proof of correctness. toggle quoted message Show quoted text 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 ? 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?? S107SCH.png
Charles A. Henstch All Messages By This Member #32127 toggle quoted message Show quoted text On Tuesday, April 8, 2025, 8:11 PM, waltcates via groups.io <cateswa@...> wrote: SEE attachement. Walt Cates, WD0GOF ? A majority of acceptance is not proof of correctness. 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 ? 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??
Peter A Markavage All Messages By This Member #32128 开云体育 wants schematic for 1st version not 3rd version. ? Pete, wa2cwa ? On Wed, 9 Apr 2025 03:11:43 +0000 "waltcates via groups.io" <cateswa@...> writes: toggle quoted message Show quoted text SEE attachement. Walt Cates, WD0GOF ? A majority of acceptance is not proof of correctness. 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 ? 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?? ?
Keith All Messages By This Member #32129 And I have it now thanks to Pete! Really appreciate your product!
Keith All Messages By This Member #32142 Digging in more on this S107. Finding more and more that have been done wrong. For some reason when it was recapped, the person used a .02 mfd electrolytic cap (C53..I think it is on the schematic) where a film cap should have been used. This may be the culprit of the 1k ohm resistor heating up that goes off the 6k6gt audio tube. Will be reworking the can cap and remove the mess underneath the radio. And instead of using a 680 ohm and 1.2k ohm 2 watt resistor off the 6k6, they used 2 680 ohm 2 watt resistors. I am sure this is not helping either.?

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