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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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Tube Audio Amp question
Back in the 60's I built a pair of amplifiers using four 6L6 output
tubes in push pull parallel mode. These were actually designed using schematics from guitar amplifiers, and I used the output transformers made for guitar amps. I ran these tubes to their limits by running the highest power supply voltage as these tubes could handle. I ended up with an extremely loud stereo, and was putting out enough power that I once blew the glass out of a window. The sound was clear as a bell too. I used some of the best and largest speakers I could get. Well, these days I am old, retired now, and have had the urge to design some tube amplifiers again. To me, they always sounded better than semiconductor amps. The 6L6 tubes were always my favorite tube. They were easy to get, powerful and had a nice sound. But here's my question. Is it possible to run EIGHT, or TWELVE, SIXTEEN of them together? I'd assume the circuit would be to push pull parallel / Series. In other words, run 2, 3, or more tubes in series TIMES FOUR (the push pull parallel part of it). Is this possible? I once figured that I was getting 140 watts RMS out of those four 6L6s, running everything at it's maximum. This time I'd like to go for 280 watts or maybe 560 watts....... Yeah, I already know getting an output transformer will be tough. Probably need something custom made. I might be old, but I still want to see if I can blow ALL the windows out of the house, just to do it !!!! I guess those of us who became adults during the 60's will never quite give up the dreams. Somehow, a 1200 watt RMS system powered by a total of 32 6L6 tubes and a wall of 18" woofers and horns just seems groovy. (After I add another 200 Amp Breaker panel in the house), I should be able to power these amps, along with a full spectrum, 10KW color organ, strobes, blacklights, lava lamps, mirored balls, and of course the original floating colored oil film kaleidoscope projection system, while listening to the Woodstock soundtrack album on 12" vinyl. This could just be way farout, heavy, trippin, and totally groovy. Mark |
#2
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Tube Audio Amp question
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#3
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Tube Audio Amp question
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#4
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Tube Audio Amp question
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#5
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Tube Audio Amp question
"boardjunkie" wrote in message oups.com... Why so much power? Sounds like overkill to me. Build 50w monoblocks and use a set of effecient horn type speakers (Klipsch or the like). That'll be plenty loud. If you want to run a bazillion pairs of output tubes in parallel....good luck finding an output transformer to match the total plate impedance. You hand wind one using the motor lams from an old 1 HP motor, and bus bar copper hand insulated with cloth tape. |
#6
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Tube Audio Amp question
On Fri, 03 Nov 2006 17:51:12 GMT, Homer J Simpson wrote:
"boardjunkie" wrote in message oups.com... Why so much power? Sounds like overkill to me. Build 50w monoblocks and use a set of effecient horn type speakers (Klipsch or the like). That'll be plenty loud. If you want to run a bazillion pairs of output tubes in parallel....good luck finding an output transformer to match the total plate impedance. You hand wind one using the motor lams from an old 1 HP motor, and bus bar copper hand insulated with cloth tape. ...during the peak of a lunar eclipse. |
#7
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Tube Audio Amp question
wrote in message ... The 6L6 tubes were always my favorite tube. They were easy to get, powerful and had a nice sound. But here's my question. Is it possible to run EIGHT, or TWELVE, SIXTEEN of them together? Sure. -- ++++++++++++++++++++++++++++++++++++++++++++++++++ ++ + Required crap appended to avoid restrictions imposed by brain + + damaged idiots. + + Server Response: '441 Posting Failed (Rejected by POST filter)', + + Port: 119, Secure(SSL): No, Server Error: 441, + + Error Number: 0x800CCCA9 + ++++++++++++++++++++++++++++++++++++++++++++++++++ ++ |
#9
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Tube Audio Amp question
"boardjunkie" wrote in message ups.com... Your post smacks of troll, but in the event you're serious, there's always these: Schematic: http://www.ampslab.com/SCHEMATICS/CarverSilver7A.gif Looks like the motor controller for a streetcar! |
#11
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Tube Audio Amp question
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#12
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Tube Audio Amp question
Michael A. Terrell wrote: Use a pair of 4CX1500 (or larger) tubes. ;-) -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida Heh....yea. Transmitting tubes. I was gonna say a pair of 250TH. |
#13
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Tube Audio Amp question
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#14
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Tube Audio Amp question
"Michael Black" wrote in message ... Not that any of this is a repair issue, but if you're going to use those, you might as well go for watercooled tubes. Get rid of that fan noise, and why not be out of the ordinary. Real men use 200 amp SCRs. -- ++++++++++++++++++++++++++++++++++++++++++++++++++ ++ + Required crap appended to avoid restrictions imposed by brain + + damaged idiots. + + Server Response: '441 Posting Failed (Rejected by POST filter)', + + Port: 119, Secure(SSL): No, Server Error: 441, + + Error Number: 0x800CCCA9 + ++++++++++++++++++++++++++++++++++++++++++++++++++ ++ |
#15
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Tube Audio Amp question
Homer J Simpson spake thus:
"Michael Black" wrote in message ... Not that any of this is a repair issue, but if you're going to use those, you might as well go for watercooled tubes. Get rid of that fan noise, and why not be out of the ordinary. Real men use 200 amp SCRs. Water-cooled? -- Just as McDonald's is where you go when you're hungry but don't really care about the quality of your food, Wikipedia is where you go when you're curious but don't really care about the quality of your knowledge. - Matthew White's WikiWatch (http://users.erols.com/mwhite28/wikiwoo.htm) |
#16
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Tube Audio Amp question
"David Nebenzahl" wrote in message s.com... Real men use 200 amp SCRs. Water-cooled? Mercury! -- ++++++++++++++++++++++++++++++++++++++++++++++++++ ++ + Required crap appended to avoid restrictions imposed by brain + + damaged idiots. + + Server Response: '441 Posting Failed (Rejected by POST filter)', + + Port: 119, Secure(SSL): No, Server Error: 441, + + Error Number: 0x800CCCA9 + ++++++++++++++++++++++++++++++++++++++++++++++++++ ++ |
#17
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Tube Audio Amp question
This could just be way farout, heavy, trippin, and totally groovy. Mark Use a pair of 4CX1500 (or larger) tubes. ;-) 3CX2500F3 even?... problem is the forced air cooling is so noisy. |
#18
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Tube Audio Amp question
TimPerry wrote:
This could just be way farout, heavy, trippin, and totally groovy. Mark Use a pair of 4CX1500 (or larger) tubes. ;-) 3CX2500F3 even?... problem is the forced air cooling is so noisy. Not if you build it right. The fans are usually vented outside the building when used for AM broadcast transmitters. I know of several stations where the air cooled transmitter is close enough for the operator to see the meters while they are ion the air, yet you can't hear them in the control room. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
#19
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Tube Audio Amp question
Michael A. Terrell wrote:
TimPerry wrote: This could just be way farout, heavy, trippin, and totally groovy. Mark Use a pair of 4CX1500 (or larger) tubes. ;-) 3CX2500F3 even?... problem is the forced air cooling is so noisy. Not if you build it right. The fans are usually vented outside the building when used for AM broadcast transmitters. I know of several stations where the air cooled transmitter is close enough for the operator to see the meters while they are ion the air, yet you can't hear them in the control room. but not IN the studio. the newer solid state stuff is a lot quiter but still has fans running. have you noticed that as power amps are now being made bigger and bigger that there are now speaker systems bening made that claim to handle the power? for example the peavey QW series. |
#20
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Tube Audio Amp question
TimPerry wrote:
Michael A. Terrell wrote: TimPerry wrote: This could just be way farout, heavy, trippin, and totally groovy. Mark Use a pair of 4CX1500 (or larger) tubes. ;-) 3CX2500F3 even?... problem is the forced air cooling is so noisy. Not if you build it right. The fans are usually vented outside the building when used for AM broadcast transmitters. I know of several stations where the air cooled transmitter is close enough for the operator to see the meters while they are ion the air, yet you can't hear them in the control room. but not IN the studio. the newer solid state stuff is a lot quiter but still has fans running. have you noticed that as power amps are now being made bigger and bigger that there are now speaker systems bening made that claim to handle the power? for example the peavey QW series. Sure, they are extremely inefficient. I used some very efficient music grade drivers and horns back in the '70s that could be heard clearly over five miles away, with a 65 watt amp. When I built a 70 watt transistor amp in the late '60s, the largest paper speaker I could find was 20 watts. Have you ever seen the insides of one of the Harris digital AM broadcast transmitters? WQBQ, The last station I visited that had one in service had a pile of badly damaged output modules from lightning strikes. I dismantled and moved their original 5 KW Gates BC-5 transmitter to WLBE in leesburg, Florida. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
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