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Wanted: Power Supply for TR-4C
Wanted - Cheap - for Drake TR-4C: broken AC-4 or AC-3, or home brewed power
supply, or modifiable power supply by other manufacturer, or interesting power transformer. -------- I want to power up a Drake TR-4C I picked up. It did not have a power supply. The price an AC-4 power supply brings today is more that the transceiver is worth. Are there more radios out there than power supplies? (Kind of like there are more horses asses than horses). Are the high AC-4 prices a function of scarcity or what? I've looked at the schematic of the AC-4 and decided that it's not rocket science. I'm not putting together an "original" collection of Drake equipment and I don't need the power supply to fit within a MS-4 speaker (which I don't have and don't need). So - I think I have some economically appealing options. - I could repair a broken AC-4, AC-3 as long as the transformer is OK. - Home brew power supplies do not scare me. - It's possible power supplies for other rigs could be adapted to work with Drake gear. - I could build my own homebrew power supply. The critical component would be the power transformer / transformers. (There are many power supply designs that would work). Here is what the power supply needs to do: Input: 117 vac Outputs: (12.6 vac @ 5.5A), (650 vdc @ 300mA average - 500 mA peak), (250 vdc @ 175 mA), (-45 to -65 vdc for bias) If any of you have something to sell me that will get me there, please let me know (with details). Thanks Jeff - KA9S |
On Wed, 8 Dec 2004 21:31:24 UTC, "KA9S-3_Jeff"
wrote: Wanted - Cheap - for Drake TR-4C: broken AC-4 or AC-3, or home brewed power supply, or modifiable power supply by other manufacturer, or interesting power transformer. -------- .... Here is what the power supply needs to do: Input: 117 vac Outputs: (12.6 vac @ 5.5A), (650 vdc @ 300mA average - 500 mA peak), (250 vdc @ 175 mA), (-45 to -65 vdc for bias) If any of you have something to sell me that will get me there, please let me know (with details). Thanks Jeff - KA9S You could probably use a Heathkit HP-23 or one of the A/B/C varients. The Heath's voltages are higher than what you spec. HP-23's are about $50. There's almost always one or two on eBay. I saw one go for $30 at a hamfest this spring. de ah6gi/4 |
On Wed, 8 Dec 2004 21:31:24 UTC, "KA9S-3_Jeff"
wrote: Wanted - Cheap - for Drake TR-4C: broken AC-4 or AC-3, or home brewed power supply, or modifiable power supply by other manufacturer, or interesting power transformer. -------- .... Here is what the power supply needs to do: Input: 117 vac Outputs: (12.6 vac @ 5.5A), (650 vdc @ 300mA average - 500 mA peak), (250 vdc @ 175 mA), (-45 to -65 vdc for bias) If any of you have something to sell me that will get me there, please let me know (with details). Thanks Jeff - KA9S You could probably use a Heathkit HP-23 or one of the A/B/C varients. The Heath's voltages are higher than what you spec. HP-23's are about $50. There's almost always one or two on eBay. I saw one go for $30 at a hamfest this spring. de ah6gi/4 |
On Wed, 8 Dec 2004 21:31:24 UTC, "KA9S-3_Jeff"
wrote: Wanted - Cheap - for Drake TR-4C: broken AC-4 or AC-3, or home brewed power supply, or modifiable power supply by other manufacturer, or interesting power transformer. -------- .... Here is what the power supply needs to do: Input: 117 vac Outputs: (12.6 vac @ 5.5A), (650 vdc @ 300mA average - 500 mA peak), (250 vdc @ 175 mA), (-45 to -65 vdc for bias) If any of you have something to sell me that will get me there, please let me know (with details). Thanks Jeff - KA9S You could probably use a Heathkit HP-23 or one of the A/B/C varients. The Heath's voltages are higher than what you spec. HP-23's are about $50. There's almost always one or two on eBay. I saw one go for $30 at a hamfest this spring. de ah6gi/4 |
Here is what the power supply needs to do:
Input: 117 vac Outputs: (12.6 vac @ 5.5A), (650 vdc @ 300mA average - 500 mA peak), (250 vdc @ 175 mA), (-45 to -65 vdc for bias) If any of you have something to sell me that will get me there, please let me know (with details). =========================== An 'all in one' transformer might be difficult to find ; however since it is assumed the unit is in a separate enclosure ,you can implement the power supply unit with up to 4 separate transformers which no doubt can be found at various ham fleamarkets . The biasvoltage can probably be obtained through a separate diode and zener voltage circuit ,using the transformer supplying 250V @175 mA ,which would enable you to implement with a maximum of 3 transformers. Good luck with your quest. Frank GM0CSZ / KN6WH |
Here is what the power supply needs to do:
Input: 117 vac Outputs: (12.6 vac @ 5.5A), (650 vdc @ 300mA average - 500 mA peak), (250 vdc @ 175 mA), (-45 to -65 vdc for bias) If any of you have something to sell me that will get me there, please let me know (with details). =========================== An 'all in one' transformer might be difficult to find ; however since it is assumed the unit is in a separate enclosure ,you can implement the power supply unit with up to 4 separate transformers which no doubt can be found at various ham fleamarkets . The biasvoltage can probably be obtained through a separate diode and zener voltage circuit ,using the transformer supplying 250V @175 mA ,which would enable you to implement with a maximum of 3 transformers. Good luck with your quest. Frank GM0CSZ / KN6WH |
Here is what the power supply needs to do:
Input: 117 vac Outputs: (12.6 vac @ 5.5A), (650 vdc @ 300mA average - 500 mA peak), (250 vdc @ 175 mA), (-45 to -65 vdc for bias) If any of you have something to sell me that will get me there, please let me know (with details). =========================== An 'all in one' transformer might be difficult to find ; however since it is assumed the unit is in a separate enclosure ,you can implement the power supply unit with up to 4 separate transformers which no doubt can be found at various ham fleamarkets . The biasvoltage can probably be obtained through a separate diode and zener voltage circuit ,using the transformer supplying 250V @175 mA ,which would enable you to implement with a maximum of 3 transformers. Good luck with your quest. Frank GM0CSZ / KN6WH |
"KA9S-3_Jeff" wrote in message
... Wanted - Cheap - for Drake TR-4C: broken AC-4 or AC-3, or home brewed power supply, or modifiable power supply by other manufacturer, or interesting power transformer. -------- I want to power up a Drake TR-4C I picked up. It did not have a power supply. The price an AC-4 power supply brings today is more that the transceiver is worth. Are there more radios out there than power supplies? (Kind of like there are more horses asses than horses). Are the high AC-4 prices a function of scarcity or what? I always see AC-3 and AC-4 units on eBay weekly.. broken and otherwise. Here are the repair web pages for the broken power units: Troubleshooting http://www.wb4hfn.com/DrakeArticles/...leshooting.htm Capacitor Rebuild http://www.wb4hfn.com/DrakeArticles/...Rebuilding.htm w9gb |
"KA9S-3_Jeff" wrote in message
... Wanted - Cheap - for Drake TR-4C: broken AC-4 or AC-3, or home brewed power supply, or modifiable power supply by other manufacturer, or interesting power transformer. -------- I want to power up a Drake TR-4C I picked up. It did not have a power supply. The price an AC-4 power supply brings today is more that the transceiver is worth. Are there more radios out there than power supplies? (Kind of like there are more horses asses than horses). Are the high AC-4 prices a function of scarcity or what? I always see AC-3 and AC-4 units on eBay weekly.. broken and otherwise. Here are the repair web pages for the broken power units: Troubleshooting http://www.wb4hfn.com/DrakeArticles/...leshooting.htm Capacitor Rebuild http://www.wb4hfn.com/DrakeArticles/...Rebuilding.htm w9gb |
"KA9S-3_Jeff" wrote in message
... Wanted - Cheap - for Drake TR-4C: broken AC-4 or AC-3, or home brewed power supply, or modifiable power supply by other manufacturer, or interesting power transformer. -------- I want to power up a Drake TR-4C I picked up. It did not have a power supply. The price an AC-4 power supply brings today is more that the transceiver is worth. Are there more radios out there than power supplies? (Kind of like there are more horses asses than horses). Are the high AC-4 prices a function of scarcity or what? I always see AC-3 and AC-4 units on eBay weekly.. broken and otherwise. Here are the repair web pages for the broken power units: Troubleshooting http://www.wb4hfn.com/DrakeArticles/...leshooting.htm Capacitor Rebuild http://www.wb4hfn.com/DrakeArticles/...Rebuilding.htm w9gb |
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