does anyone try 2x6550 100w amp ?
base on the 'principles of power' book by kevin o'conner, there is one schematic just using 2x6550 tubes & 1x12AX7 output 100W !
is this possibe??
anyone try this ?
cal
base on the 'principles of power' book by kevin o'conner, there is one schematic just using 2x6550 tubes & 1x12AX7 output 100W !
is this possibe??
anyone try this ?
cal
I do not have the schematic diagram of your amplifier, but I can get out of 2 x EL34 and an ecc82 100 watts with 900 Volts on the anode and -39V on G1. (possible with Philips and Telefunken tubes).
Yes, it's possible. Take a look at the 6550A datasheet. As it happens, I've got a 6550-based amp on hand which puts out 100W (it's an Ampex), running the output stage in pentode with about 520V on the plates and a 2200 ohm plate to plate load.
how the h....you do with EL34 100W ??
the noise must be loud ? how is the sound?
have you try 2x 6550 100W on that book?
I just want to built 60w-100w amp with minimum cost!
any reccomendation? how about that 2x6550 schematic?
cal
the noise must be loud ? how is the sound?
have you try 2x 6550 100W on that book?
I just want to built 60w-100w amp with minimum cost!
any reccomendation? how about that 2x6550 schematic?
cal
SY
I would like to see a schematic of the Ampex or better yet please send it to me and I will give it a nice home.
I would like to see a schematic of the Ampex or better yet please send it to me and I will give it a nice home.
burnedfingers said:
I'd like to see it myself. I can't locate any info about this amp.
From what I understand, Ampex power amps are collectors' items; I wish I knew that before I disassembled the twin of this amp to provide iron and chassis for my big triode amp. I'm tempted to eBay the intact one.
SY
With your skill you could probably draw up a schematic in about 2 min or less.
If your thinking about ebaying it ...please consider your friends here first.😉
With your skill you could probably draw up a schematic in about 2 min or less.
If your thinking about ebaying it ...please consider your friends here first.😉
I have here an 80W 2x6550 amp. I don't have a schematic, don't know the load of the output tubes. It runs the 6550 with 570V on the anode and 320V (regulated) on the screens. ~2000uF total PSU capacitance 😀
It uses a 12pin triple triode for the audio path, the first two ones are cascaded, the last one is a cathodyne phase splitter.
An horrible circuit that sounds good 😎
PS the 12pin triode/pentode is (I think) used as a regulator for the input stage. The screens have their own solid state one.
An externally hosted image should be here but it was not working when we last tested it.
It uses a 12pin triple triode for the audio path, the first two ones are cascaded, the last one is a cathodyne phase splitter.
An horrible circuit that sounds good 😎
PS the 12pin triode/pentode is (I think) used as a regulator for the input stage. The screens have their own solid state one.
The sound of an EL34 is very good.
I also buils an amplifier with an output of 1200 watts only with EL34's.
I already put a link of this amplifier (foto's and schema) in another topic of this forum.
I also buils an amplifier with an output of 1200 watts only with EL34's.
I already put a link of this amplifier (foto's and schema) in another topic of this forum.
SY
What I have on the Priciples of power boob by kevin o conner is only using 1x12AX7 and 2x 6550.
it says 300Volt screen voltage. not sure the anode voltage, but surely less than 500V.
it requires 1650R hammond OT
SY,
I need this schematic to build my 100W project with very low budget.
I need to ask someone if this schematic relly works.....
or
if you can draw me a schematic that produce 100W or about that much with only using 2 tubes and LOW LOW COST I will be appriciate 🙂
missisipi
I wonder how's that 11200W EL34 sounds ? how much that cost ?
cal
What I have on the Priciples of power boob by kevin o conner is only using 1x12AX7 and 2x 6550.
it says 300Volt screen voltage. not sure the anode voltage, but surely less than 500V.
it requires 1650R hammond OT
SY,
I need this schematic to build my 100W project with very low budget.
I need to ask someone if this schematic relly works.....
or
if you can draw me a schematic that produce 100W or about that much with only using 2 tubes and LOW LOW COST I will be appriciate 🙂
missisipi
I wonder how's that 11200W EL34 sounds ? how much that cost ?
cal
SY,
how much it cost minimum for 100W amp ?
if only 2x6550 i think i can use it !
mississippi
i just check your site 1200W, scary....
guys show the simple schematic 100W to build.
using only 2 power tube, may be 6550 or KT88 ?
or
SY
draw me the schematic..
please....
cal
how much it cost minimum for 100W amp ?
if only 2x6550 i think i can use it !
mississippi
i just check your site 1200W, scary....
guys show the simple schematic 100W to build.
using only 2 power tube, may be 6550 or KT88 ?
or
SY
draw me the schematic..
please....
cal
The voice of experience speaks here. It is possible to get a lot of power out of 6550's or even EL34's by operating the plate at high voltage, and regulating the screen in the 300 to 400 volt range. To avoid over dissipating the tubes the operating point is shifted closer to class B. Usually AB2 is used.
This of course requires a LOT of voltage swing at the plate. Peak to peak voltage swings of 1500 volts are not uncommon. For common audio tubes pin 3 is the plate, and pin 2 is the filament which is usually grounded. These pins are close together, and I have seen an arc jump from pin 3 to pin 2 more than once. It is often fatal to components including the OPT or the speakers. This is often the limiting factor when pushing a tube amplifier to max power. You MUST use high quality ceramic tube sockets, good quality tubes, and everything MUST be clean. High humidity (often approaches 100% here) will make things worse. The speaker load must be matched to avoid extreme voltage swings, and speakers with a wide impedance variation VS frequency should be avoided.
There were a few amplifiers made with 6550's that made as much as 120 watts per pair of tubes (Ampeg SVT and the Sunn Coloseum made about 350 watts with 6 X 6550) with 650 volts on the plates. It would be possible to build one of these designs with a single pair of tubes and the proper components to get 100 watts. The utmost care and attention to detail would be required during the build, and something like this should not be attempted by a builder without a lot of tube amp building experience.
The 6550 has a 40 watt rated plate, yet there are few designs yielding more than 60 watts. This is due to the potential arc over issues. There were plenty of amplifier designs up to 100 watts with the 807 in the 50's and 60's, although most were never intended to be HiFi. The 807 has only a 19 watt rated plate, and it is essentially a 6L6GB with the plate connection moved to a cap on the top of the tube. The top cap solves the arc over issue, so thet higher voltages can be used without sparks and flames.
I have found that the easiest path to big power in tube amplifiers is to use TV sweep tubes. These have plate dissipation ratings up to 45 watts, and plate voltage ratings to 990 volts. I have seen 150 watts from a pair of 6LW6 tubes. Amplifiers like this require a lot of experimentation to get right. The voltages and currents involved can kill you DEAD rather instantly, and the potential for blown, burnt, or otherwise crispy parts is high. The price of admission is not cheap either. Know what you are doing before you go there.
If I havent scared you off yet, there was a schematic for a 90 watt per channel amp using sweep tubes in the March 1999 issue of Glass Audio magazine, which used to be on their web site, but seems to have vanished recently.
There is a thread dealing with high power 807 based amplifiers here. These concepts could be used with other tubes.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=93612
This of course requires a LOT of voltage swing at the plate. Peak to peak voltage swings of 1500 volts are not uncommon. For common audio tubes pin 3 is the plate, and pin 2 is the filament which is usually grounded. These pins are close together, and I have seen an arc jump from pin 3 to pin 2 more than once. It is often fatal to components including the OPT or the speakers. This is often the limiting factor when pushing a tube amplifier to max power. You MUST use high quality ceramic tube sockets, good quality tubes, and everything MUST be clean. High humidity (often approaches 100% here) will make things worse. The speaker load must be matched to avoid extreme voltage swings, and speakers with a wide impedance variation VS frequency should be avoided.
There were a few amplifiers made with 6550's that made as much as 120 watts per pair of tubes (Ampeg SVT and the Sunn Coloseum made about 350 watts with 6 X 6550) with 650 volts on the plates. It would be possible to build one of these designs with a single pair of tubes and the proper components to get 100 watts. The utmost care and attention to detail would be required during the build, and something like this should not be attempted by a builder without a lot of tube amp building experience.
The 6550 has a 40 watt rated plate, yet there are few designs yielding more than 60 watts. This is due to the potential arc over issues. There were plenty of amplifier designs up to 100 watts with the 807 in the 50's and 60's, although most were never intended to be HiFi. The 807 has only a 19 watt rated plate, and it is essentially a 6L6GB with the plate connection moved to a cap on the top of the tube. The top cap solves the arc over issue, so thet higher voltages can be used without sparks and flames.
I have found that the easiest path to big power in tube amplifiers is to use TV sweep tubes. These have plate dissipation ratings up to 45 watts, and plate voltage ratings to 990 volts. I have seen 150 watts from a pair of 6LW6 tubes. Amplifiers like this require a lot of experimentation to get right. The voltages and currents involved can kill you DEAD rather instantly, and the potential for blown, burnt, or otherwise crispy parts is high. The price of admission is not cheap either. Know what you are doing before you go there.
If I havent scared you off yet, there was a schematic for a 90 watt per channel amp using sweep tubes in the March 1999 issue of Glass Audio magazine, which used to be on their web site, but seems to have vanished recently.
There is a thread dealing with high power 807 based amplifiers here. These concepts could be used with other tubes.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=93612
tubelab,
well i'm not scare but don't wont to get fried either.
too bad that 90W schematic is gone, that's what I need.
guys,, all I need is a schematic using 2 power tube like 6550, or KT88, or cheaper that can produce around 100W.
budget is less than 1000US$ (max)
show me the schematic that really works
cal
well i'm not scare but don't wont to get fried either.
too bad that 90W schematic is gone, that's what I need.
guys,, all I need is a schematic using 2 power tube like 6550, or KT88, or cheaper that can produce around 100W.
budget is less than 1000US$ (max)
show me the schematic that really works
cal
Here some links to 100 watt's amplifiers with KT88 (6550).
http://www.diyparadiso.com/ppkt88mono1.htm
http://www2u.biglobe.ne.jp/~tossie/F-KT88PP-E.html
http://www.world-designs.co.uk/acatalog/AmpKits.html (design article part2)
http://www.diyparadiso.com/ppkt88mono1.htm
http://www2u.biglobe.ne.jp/~tossie/F-KT88PP-E.html
http://www.world-designs.co.uk/acatalog/AmpKits.html (design article part2)
The VAC Phi 110 "Beta" integrated tube amp gets 110w/ch out of a pair of KT88s (same type tube as 6550) per side. Though, with the bias they're running, you can expect to replace output tubes once every 3 years or so, if you use it much (kind of like a race car- high performance, but a bit harder on parts than a "streeter")...
However, the tradeoff is taken for about the BEST sound I've EVER encountered from ANY amp, regardless of topology... it's made every speaker we've hooked to it sound better than the same speaker on any other amp, period...
Regards,
Gordon.
However, the tradeoff is taken for about the BEST sound I've EVER encountered from ANY amp, regardless of topology... it's made every speaker we've hooked to it sound better than the same speaker on any other amp, period...
Regards,
Gordon.
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