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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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High voltage electrolytics
Does anyone know of a good source for HV electrolytics (600 or above)? Or are "NOS" or eBay the only options any more? Are any companies still making them in small runs for those of us who (in growing numbers) are still using and preferring tube audio? Most values can be found in up to 450V or 500V ranges, but most tube setups use voltages around 600V and I've blown 500V units attempting to use them as suitable replacements. Been able to find various values at many different suppliers, but does anyone know of a good 'one stop shop' for these beasts? |
#2
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High voltage electrolytics
EricM wrote: Does anyone know of a good source for HV electrolytics (600 or above)? Or are "NOS" or eBay the only options any more? Are any companies still making them in small runs for those of us who (in growing numbers) are still using and preferring tube audio? Most values can be found in up to 450V or 500V ranges, but most tube setups use voltages around 600V and I've blown 500V units attempting to use them as suitable replacements. Been able to find various values at many different suppliers, but does anyone know of a good 'one stop shop' for these beasts? Ask on the news:rec.antiques.radio+phono newsgroup. They have a lot of suppliers to choose from. http://groups.google.com/group/rec.antiques.radio+phono -- http://improve-usenet.org/index.html Use any search engine other than Google till they stop polluting USENET with porn and junk commercial SPAM If you have broadband, your ISP may have a NNTP news server included in your account: http://www.usenettools.net/ISP.htm |
#3
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High voltage electrolytics
On Apr 20, 10:04*pm, EricM wrote:
Does anyone know of a good source for HV electrolytics (600 or above)? *Or are "NOS" or eBay the only options any more? *Are any companies still making them in small runs for those of us who (in growing numbers) are still using and preferring tube audio? *Most values can be found in up to 450V or 500V ranges, but most tube setups use voltages around 600V and I've blown 500V units attempting to use them as suitable replacements. *Been able to find various values at many different suppliers, but does anyone know of a good 'one stop shop' for these beasts? Don't bother with NOS. They deteriorate sitting around unused. If you need a 600v+ V rating just use 2 in series with balancing resistors around 220k. Say you need a 40u @ 600wvdc, use 2 80s @ 350 or better in series. The ESR will add in series but for a plate/filament transformer based pwr supply it won't make a big difference. Look at this schemo for an example: http://www.ampwares.com/ffg/schem/ba...b165_schem.gif |
#4
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High voltage electrolytics
"boardjunkie" wrote in message ... On Apr 20, 10:04 pm, EricM wrote: Does anyone know of a good source for HV electrolytics (600 or above)? Or are "NOS" or eBay the only options any more? Are any companies still making them in small runs for those of us who (in growing numbers) are still using and preferring tube audio? Most values can be found in up to 450V or 500V ranges, but most tube setups use voltages around 600V and I've blown 500V units attempting to use them as suitable replacements. Been able to find various values at many different suppliers, but does anyone know of a good 'one stop shop' for these beasts? Don't bother with NOS. They deteriorate sitting around unused. If you need a 600v+ V rating just use 2 in series with balancing resistors around 220k. Say you need a 40u @ 600wvdc, use 2 80s @ 350 or better in series. The ESR will add in series but for a plate/filament transformer based pwr supply it won't make a big difference. Look at this schemo for an example: http://www.ampwares.com/ffg/schem/ba...b165_schem.gif That's standard practice in a HV tube B+ supply. Most of the overvoltage situations in tube amps occur at startup before the tubes start to draw current. You can clamp the B+ using zeners to protect your caps at startup if it's a problem, and/or wire up a switch to apply power to the heaters before the B+ gets turned on. |
#5
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High voltage electrolytics
Greetings Eric..
As I look, it appears that Mouser has them all the way up to 800WVDC. http://www.mouser.com/search/Refine....&N s=P_SField In any event, even if they don't have exactly what you're looking for, give them a call and they'll know who does OR the manufacturer to contact. Cheers, Mr. Mentor "EricM" wrote in message ... | | Does anyone know of a good source for HV electrolytics (600 or | above)? Or are "NOS" or eBay the only options any more? Are any | companies still making them in small runs for those of us who (in | growing numbers) are still using and preferring tube audio? Most | values can be found in up to 450V or 500V ranges, but most tube setups | use voltages around 600V and I've blown 500V units attempting to use | them as suitable replacements. Been able to find various values at | many different suppliers, but does anyone know of a good 'one stop | shop' for these beasts? |
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