Rocky,
That's precisely my point. Using the stock power trafos and an external 240/120 step-down autoformer is inexpensive and "fool proof".
Build your PMs stock. Break them in and find out their strengths and weaknesses in combination with the rest of your equipment, then you can start tweaking.
Eli Duttman said:
Autoformers aren't all that inexpensive... that & saved shipping should get Rocky an appropriate 240 mains trafo. If he gets a discount due to no trafos he is even further ahead. The 1st thing that struck me about the Paramours when i saw them was how inadequate looking the power trafo was....
dave
Does anyone know what voltages/amperes the stock maintransformer outputs? Would be good to know so that I at least can check out availability..
EMail Doc Bottlehead (docb@bottlehead.com). Explain your intent to purchase and your situation (50 Hz./240 VAC zone). Ask him for the PM power trafo specs.
BTW, you can order the PM manual before you order the kit. IIRC, the price of the manual is deducted from the kit, if you ordered it separately.
Konnichiwa,
I am surprised that with all that Single tube stuff one link never came up:
http://sempermusica.com/
This is the very european (if we count russai as european) killer SE Amp, all parts european, designed for european voltages, european tastes in sound and so on....
The whole set of transformers and chokes comes to appx. £200/€300 (all EEC taxes paid), make your case any way you like.
And observe some of the notes in the text. I know Brian myself and know both his rather extreme IT coupled Globe 45 Amplifiers with STC 3M/167A Drivers (that's a serious amount of money in valves alone) he refers to. If TGES comes even close than I'd take it to be the bargain of all. I heard an eariler incarnation of the Amp and even back then it sounded quite good, to say the least.
I'm still figuring on one day making a 4 X 6S45 PSE output stage, 4 X 6S45 as active CCS and a suitable 600R/8R Parallel feed Output Transformer with a 6S45 driverstage using a 4:1 stepdown interstage transformer. Except, i have no time right now.
Sayonara
Rocky said:
I am surprised that with all that Single tube stuff one link never came up:
http://sempermusica.com/
This is the very european (if we count russai as european) killer SE Amp, all parts european, designed for european voltages, european tastes in sound and so on....
An externally hosted image should be here but it was not working when we last tested it.
The whole set of transformers and chokes comes to appx. £200/€300 (all EEC taxes paid), make your case any way you like.
And observe some of the notes in the text. I know Brian myself and know both his rather extreme IT coupled Globe 45 Amplifiers with STC 3M/167A Drivers (that's a serious amount of money in valves alone) he refers to. If TGES comes even close than I'd take it to be the bargain of all. I heard an eariler incarnation of the Amp and even back then it sounded quite good, to say the least.
I'm still figuring on one day making a 4 X 6S45 PSE output stage, 4 X 6S45 as active CCS and a suitable 600R/8R Parallel feed Output Transformer with a 6S45 driverstage using a 4:1 stepdown interstage transformer. Except, i have no time right now.
Sayonara
Sayonara,
Searching this forum in the past, I have come across your name more than a few times in many very interresting tube-related discussions. Your opinion on this is greatly appreciated. I will check your link and return with some questions shortly.
Searching this forum in the past, I have come across your name more than a few times in many very interresting tube-related discussions. Your opinion on this is greatly appreciated. I will check your link and return with some questions shortly.
Re: Re: Re: Any good flea-watt SET designs?
The "chock" connected to the plate of 6C45P is not a chock. It is the output transformer (OPT).
The 16,8 etc on the right hand side of the OPT tell you the secondary (output) impedences of the OPT so that you can hook up your speakers accordingly.
Hi Rocky,Rocky said:
The "chock" connected to the plate of 6C45P is not a chock. It is the output transformer (OPT).
The 16,8 etc on the right hand side of the OPT tell you the secondary (output) impedences of the OPT so that you can hook up your speakers accordingly.
combination input transformer, grid choke... the 6C45Pi really likes to be transformer loaded
dave
dave
An input transformer... one thing I've never noticed on a tube amp 🙂 Thanks dave.
New stuff can be learned every day 🙂
The 6S45P tube... similar to the "standard" 45? Is it in fact a standard 45?
Is the circuit so-called Single Ended Triode..?
New stuff can be learned every day 🙂
The 6S45P tube... similar to the "standard" 45? Is it in fact a standard 45?
Is the circuit so-called Single Ended Triode..?
Yes, it is.
The 6S45P is an indirectly heated tube that is VERY different from the directly heated 45.
, but here's I think one of the last big ones...:
Hi,
1) Yes. Even a 1/4 carbon comp would be fine.
2) Looks like a pot to me, minimum 2W Clarostat or similar.
3) If you plan on monoblocks, just build per the diagram twice.
Cheers,😉
1) Yes. Even a 1/4 carbon comp would be fine.
2) Looks like a pot to me, minimum 2W Clarostat or similar.
3) If you plan on monoblocks, just build per the diagram twice.
Cheers,😉
Bottlehead
Another thing about Bottlehead to keep in mind: In order to keep costs down, they don't stock a huge inventory of parts. They bill your credit card and then order the parts. They are quite reputable and that didn't bother me. However, read their ordering section so that you understand it could take 6-wks to fill your order. I ordered a Bottlehead Foreplay preamp last week.
Another thing about Bottlehead to keep in mind: In order to keep costs down, they don't stock a huge inventory of parts. They bill your credit card and then order the parts. They are quite reputable and that didn't bother me. However, read their ordering section so that you understand it could take 6-wks to fill your order. I ordered a Bottlehead Foreplay preamp last week.
" If you plan on monoblocks, just build per the diagram twice."
Actually I think you will have to adjust the 22K bleeder resistor for the correct plate voltage if you are going to build monoblocks. The current draw will differ if supplying only one channel.
Actually I think you will have to adjust the 22K bleeder resistor for the correct plate voltage if you are going to build monoblocks. The current draw will differ if supplying only one channel.
The Great El Spuddo!
'ello. 'ello what have we here? I'm a bit late on the scene with this thread but I'm the bloke who put up the sempermusica page.
The Mladen Krklec iron is no longer available (though I MAY have a spare pair of his output transformers around somewhere).
I do still have the specified 220 ohm biasing pots and carbon composition grid-stopper resistors available.
Funnily enough I have onlyj ust (within the last two weeks) pensioned off the The Great El Spuddo! prototype after over two years of sterling service. It did indeed sound surprisingly similar to my 45 amp that Thorsten described even when the latter was equipped with tasty RCA UX245 globe 45s. It may because the input/driver valve (STC 3A/167M, UK loktal version of the WE 437A) was very similar to the Russian 6S45P (6C45Pi).
I have in fact deconstructed the 45 amps (Old Faithfuls) and sold the valves to finance my new amp (The Magnificent One(s) )
I built Spuddo as two monobloks with shared PSU first stage in a third box with the 22k bleeder at the output.
I am afraid the email address listed on the sempermusica site is now defunct so interested parties please contact me through this forum.
Semper Musica, Semper Simplistica!
Brian 😉
'ello. 'ello what have we here? I'm a bit late on the scene with this thread but I'm the bloke who put up the sempermusica page.
The Mladen Krklec iron is no longer available (though I MAY have a spare pair of his output transformers around somewhere).
I do still have the specified 220 ohm biasing pots and carbon composition grid-stopper resistors available.
Funnily enough I have onlyj ust (within the last two weeks) pensioned off the The Great El Spuddo! prototype after over two years of sterling service. It did indeed sound surprisingly similar to my 45 amp that Thorsten described even when the latter was equipped with tasty RCA UX245 globe 45s. It may because the input/driver valve (STC 3A/167M, UK loktal version of the WE 437A) was very similar to the Russian 6S45P (6C45Pi).
I have in fact deconstructed the 45 amps (Old Faithfuls) and sold the valves to finance my new amp (The Magnificent One(s) )
I built Spuddo as two monobloks with shared PSU first stage in a third box with the 22k bleeder at the output.
I am afraid the email address listed on the sempermusica site is now defunct so interested parties please contact me through this forum.
Semper Musica, Semper Simplistica!
Brian 😉
Re: The Great El Spuddo!
I also have the 220uF/16V Black Gates and UNmatched 6S45P valves (matching is not necessary because of the adjustable biasing facility. Kudos to Thorsten)
BTW I obtained further refinement in the sound by replacing the cheap 4.7uF Russian paper capacitors with 6.8uF Mundorf Supremes.
Brian.
Brian Clark said:
I also have the 220uF/16V Black Gates and UNmatched 6S45P valves (matching is not necessary because of the adjustable biasing facility. Kudos to Thorsten)
BTW I obtained further refinement in the sound by replacing the cheap 4.7uF Russian paper capacitors with 6.8uF Mundorf Supremes.
Brian.
Interrestingly, there are suggested som other chokes & trafos in another El-Spuddo schematic available right here (PDF)
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