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Title: B&W 5100 Audio Mods from Mo W5KD Post by: k3msb on November 04, 2022, 12:02:42 AM Many, many moons ago I had a few QSOs with Mo W5KD (SK) on 10M AM. I was on my 5100B and he was on his nice sounding 5100.
During one of those conversations I told him I had a 5100 awaiting restoration and he told me the audio mods he did on his 5100. I wrote them down (many, many moons ago....) and I'm pretty sure these are what the mods are: C46: Change from 0.001 to 0.005 C47: Change from 50 pf mica to 0.005 disc ceramic C48: Change from 0.001 to 0.027 C51: Change from 0.001 to 0.033 C53: Change to 50 uF 25 (or 50) V Put 50K (2 100K 2W in parallel) across secondary of T1 and T2. Connect Pin 5 and 6 of V11 (6AQ5). Recently I emailed Jim W5JO and he remembers the mods, but isn't completely sure as I'm not, especially about connecting pins 5 and 6 on V11. I've been using my 5100 on CW for a while with the modulator out awaiting modification, and it's time to get the radio back together again for upcoming 10M AM fun. Thank you! Mark K3MSB Title: Re: B&W 5100 Audio Mods from Mo W5KD Post by: DMOD on November 11, 2022, 09:12:36 PM Many, many moons ago I had a few QSOs with Mo W5KD (SK) on 10M AM. I was on my 5100B and he was on his nice sounding 5100. During one of those conversations I told him I had a 5100 awaiting restoration and he told me the audio mods he did on his 5100. I wrote them down (many, many moons ago....) and I'm pretty sure these are what the mods are: C46: Change from 0.001 to 0.005 C47: Change from 50 pf mica to 0.005 disc ceramic C48: Change from 0.001 to 0.027 C51: Change from 0.001 to 0.033 C53: Change to 50 uF 25 (or 50) V Put 50K (2 100K 2W in parallel) across secondary of T1 and T2. Connect Pin 5 and 6 of V11 (6AQ5). Recently I emailed Jim W5JO and he remembers the mods, but isn't completely sure as I'm not, especially about connecting pins 5 and 6 on V11. I've been using my 5100 on CW for a while with the modulator out awaiting modification, and it's time to get the radio back together again for upcoming 10M AM fun. Thank you! Mark K3MSB C46: Change from 0.001 to 0.005 (OK) C47: Change from 50 pf mica to 0.005 disc ceramic (No, 100 pF is better; 0.005 is too much) C48: Change from 0.001 to 0.027 (No, 0.01uF is better) C51: Change from 0.001 to 0.033 (No, 0.01uF is better) C53: Change to 50 uF 25 (or 50) V (OK, 25 volts is sufficient) Put 50K (2 100K 2W in parallel) across secondary of T1 and T2. (100k across both secondaries is sufficient). Connect Pin 5 and 6 of V11 (6AQ5). (I would leave as is). Phil - AC0OB Title: Re: B&W 5100 Audio Mods from Mo W5KD Post by: Tom W2ILA on January 15, 2023, 10:02:49 PM Just looked at my 5100B schematic and all caps on the modulator are listed as C401-c410 so none of these values cross reference.
Is there a couplate in the schematic that you’re using as a reference? 73 Title: Re: B&W 5100 Audio Mods from Mo W5KD Post by: Pete, WA2CWA on January 16, 2023, 01:02:47 AM Just looked at my 5100B schematic and all caps on the modulator are listed as C401-c410 so none of these values cross reference. You have to use the B&W 5100 schematic NOT the 5100B.Is there a couplate in the schematic that you’re using as a reference? 73 |