On Thu, 8 Dec 2016 20:52:41 -0800 (PST), jurb6006@gmail.com wrote:>>"AM Radio stations used some that would do 50,000W, I believe. Is that >sufficient? " > >But that is class C. not quite audiophile I would say.Old style amplitude modulated transmitter consisted of high power audio amplifier (class AB/B) driving the primary of the modulation transformer. The secondary was connected between the V+ supply and the anode of the RF tube. This effectively varied the anode voltage of the class-C RF tube and hence varied the RF output in accordance with the audio waveform. The modulation audio amplifier tube and the RF tube had similar power ratings.
What is the most powerful audio output tube?
Started by ●December 8, 2016
Reply by ●December 9, 20162016-12-09
Reply by ●December 9, 20162016-12-09
boomer#...@none.com wrote:> > What is the most powerful audio output tube, as far as RMS wattage > output? > > I have gotten some powerful sound from four 6L6 tubes in push-pull > parallel. but I want more. I know it's possible to use eight 6L6 tubes, > which I believe is called " push-pull parallel - parallel", but I'm > looking into other possible tubes. > > At one time, I thought the 807 tube was more powerful than the 6L6, but > after careful research, it's almost identical, but with a different > envelope (plate on the top cap). > > I'm looking to get a full 500W RMS (or more) output (per channel), from > all tubes, .... With four 6L6 tubes in PPP, I can only get around 120W > RMS (per channel). >** Take a look at the Fender 400PS. It uses 6 x 6550s or KT88s to get a genuine 435W rms. Very clever output stage set up, with transformer drive and multiple secondaries each supplying 1/3 of the power. http://bmamps.com/Schematics/fender/400ps.pdf .... Phil
Reply by ●December 9, 20162016-12-09
On 9.12.16 07:16, upsidedown@downunder.com wrote:> On Thu, 8 Dec 2016 20:52:41 -0800 (PST), jurb6006@gmail.com wrote: > >>> "AM Radio stations used some that would do 50,000W, I believe. Is that >> sufficient? " >> >> But that is class C. not quite audiophile I would say. > > Old style amplitude modulated transmitter consisted of high power > audio amplifier (class AB/B) driving the primary of the modulation > transformer. The secondary was connected between the V+ supply and > the anode of the RF tube. This effectively varied the anode voltage of > the class-C RF tube and hence varied the RF output in accordance with > the audio waveform. > > The modulation audio amplifier tube and the RF tube had similar power > ratings. >For 100% plate modulation, the audio amplifier output power must be one-half the input power of the Class C power amplifier. In addition, the Class C amplifier must be dimensioned so that it is able to provide the modulation peak power (4 times carrier power) with double carrier-level plate voltage. -- -TV
Reply by ●December 9, 20162016-12-09
dcaster@krl.org wrote:> It seems to me that the most economical approach to having a tube sounding high power amp would be to build> a low power tube amplifier to get the sound desired and follow that with a high fidelity high power class D amplifier. http://webpages.charter.net/dawill/tmoranwms/Elec_Compound2.html Best regards, Piotr
Reply by ●December 9, 20162016-12-09
On 08/12/2016 15:19, boomer#6877250@none.com wrote:> What is the most powerful audio output tube, as far as RMS wattage > output? > > I have gotten some powerful sound from four 6L6 tubes in push-pull > parallel. but I want more. I know it's possible to use eight 6L6 tubes, > which I believe is called " push-pull parallel - parallel", but I'm > looking into other possible tubes. > > At one time, I thought the 807 tube was more powerful than the 6L6, but > after careful research, it's almost identical, but with a different > envelope (plate on the top cap). > > I'm looking to get a full 500W RMS (or more) output (per channel), from > all tubes, .... With four 6L6 tubes in PPP, I can only get around 120W > RMS (per channel). >I had one of these in my collection: <http://r-type.org/exhib/aaa1098.htm> sold it on ebay to some audio guy for lot of money :) The heater alone consumes 90 watts. piglet
Reply by ●December 9, 20162016-12-09
On Thursday, December 8, 2016 at 8:16:07 PM UTC-5, krw wrote:> On Thu, 8 Dec 2016 08:42:32 -0800 (PST), makolber@yahoo.com wrote: > > > > >> > What is the most powerful audio output tube, as far as RMS wattage > >> > output? > >> > > >> > >> > > > >You want a pair of 6427's like WABC used to run > > > >http://hawkins.pair.com/wabc.shtml > > > >(RMS watts is a misnomer) > > https://www.youtube.com/watch?v=CbHjcwIoTiYnice!
Reply by ●December 9, 20162016-12-09
boB <boB@theresnoplacelikehome.com> wrote:> On Thu, 08 Dec 2016 09:19:23 -0600, boomer#6877250@none.com wrote: > > >What is the most powerful audio output tube, as far as RMS wattage > >output? > > > >I have gotten some powerful sound from four 6L6 tubes in push-pull > >parallel. but I want more. I know it's possible to use eight 6L6 tubes, > >which I believe is called " push-pull parallel - parallel", but I'm > >looking into other possible tubes. > > > >At one time, I thought the 807 tube was more powerful than the 6L6, but > >after careful research, it's almost identical, but with a different > >envelope (plate on the top cap). > > > >I'm looking to get a full 500W RMS (or more) output (per channel), from > >all tubes, .... With four 6L6 tubes in PPP, I can only get around 120W > >RMS (per channel). > > > How about a high AVERAGE output wattage ? > > :) > > boBI think you are fighting a losing battle here. About 10 or 20 years ago I wrote to the editors of the RSGB magazine complaining about "RMS power" being used in an article they published and they refused to publish my letter, apparently on the grounds that I was a boring pedant. Admittedly AM does get a bit complicated when the peak RF power of an AM transmitter is a real power (not an instaneous peak of a sinewave) whereas it represents the peak of an audio waveform of which the power is not determined by the level of this peak. But there is still no such thing as RMS power. -- Roger Hayter
Reply by ●December 9, 20162016-12-09
boomer#6877250@none.com wrote:> What is the most powerful audio output tube, as far as RMS wattage > output? > > I have gotten some powerful sound from four 6L6 tubes in push-pull > parallel. but I want more. I know it's possible to use eight 6L6 tubes, > which I believe is called " push-pull parallel - parallel", but I'm > looking into other possible tubes. > > At one time, I thought the 807 tube was more powerful than the 6L6, but > after careful research, it's almost identical, but with a different > envelope (plate on the top cap). > > I'm looking to get a full 500W RMS (or more) output (per channel), from > all tubes, .... With four 6L6 tubes in PPP, I can only get around 120W > RMS (per channel).http://www.g8wrb.org/data/Eimac/8973.pdf A pair will give you over two megawatts. -- Never piss off an Engineer! They don't get mad. They don't get even. They go for over unity! ;-)
Reply by ●December 9, 20162016-12-09
On Friday, 9 December 2016 20:45:22 UTC, Michael Terrell wrote:> http://www.g8wrb.org/data/Eimac/8973.pdf A pair will give you over two > megawatts.650A heater current. I'm not sure my glass 2v accumulators would support that. NT
Reply by ●December 9, 20162016-12-09
Den lørdag den 10. december 2016 kl. 01.32.33 UTC+1 skrev tabb...@gmail.com:> On Friday, 9 December 2016 20:45:22 UTC, Michael Terrell wrote: > > > http://www.g8wrb.org/data/Eimac/8973.pdf A pair will give you over two > > megawatts. > > 650A heater current. I'm not sure my glass 2v accumulators would support that. >"only" ~12kW, a couple of BIG stick welders and you are getting there :)
