kt88
here is a few still looking
http://www.pmillett.addr.com/push-pull_kt88_class_a_amp_with_universal_driver_pcb.htm
http://www.n.ethz.ch/student/brennwam/download/KT88/kt88partslist.pdf
http://members.tripod.com/richard984/kt88_monoblocs.htm
http://www.crdevelopments.com/pdf_files/Woodham KT88 Intrgrated Power Amplifier.PDF
this one in class a
http://www.velleman.be/downloads/0/Manual_K8010.pdf
here is a few still looking
http://www.pmillett.addr.com/push-pull_kt88_class_a_amp_with_universal_driver_pcb.htm
http://www.n.ethz.ch/student/brennwam/download/KT88/kt88partslist.pdf
http://members.tripod.com/richard984/kt88_monoblocs.htm
http://www.crdevelopments.com/pdf_files/Woodham KT88 Intrgrated Power Amplifier.PDF
this one in class a
http://www.velleman.be/downloads/0/Manual_K8010.pdf
I've designed one myself, however I can't give any guarantees that it will work the way you wan't. I have successfully assembled one channel to try out and it works like a charm, the only "problem" is the low output power. But I'm beginnig to think that low power is something that almost all single-ended amps are limited by. Anyway... here is the schematics
http://213.67.45.70/se_kt88_3.gif
[edit]
About the cathode-resistor for the KT88. I've tried 470 and 330 ohm. Both with good result. It feels like it sounds best with 470, which makes the amp draw 75mA at 400V.
http://213.67.45.70/se_kt88_3.gif
[edit]
About the cathode-resistor for the KT88. I've tried 470 and 330 ohm. Both with good result. It feels like it sounds best with 470, which makes the amp draw 75mA at 400V.
If you're not restricting yourself to half-@$$ed amps (single ended), I'd build the classic Williamson circuit. Well proven. Use a 380V B+, 4000 ohm p-p, cathode current at about 80-100 ma per tube. You'll get about 25-30 watts in pentode, put out a satisfyingly large amount of heat, and help your tube dealer make the next payment on his Mercedes.
Hi,
He,he...how do you think I managed to run five Porsches in those days?
Anyway you look at it once you decide for class A, "la classe royale" as we call it, you have to bear the cost.
I love what it can do but to me it's not a must unless you go the SE path....upon which I'd rather not comment.
Cheers,
He,he...how do you think I managed to run five Porsches in those days?
Anyway you look at it once you decide for class A, "la classe royale" as we call it, you have to bear the cost.
I love what it can do but to me it's not a must unless you go the SE path....upon which I'd rather not comment.
Cheers,
Hi,
Make that a kings' ransom nowadays...glad to see you keep your sense of humour, SY.
Still, it is called that way over here for it's in the eyes of many people the only valid road to sonic bliss.
All in all I tend to agree although I do not always obey, running even less efficient OTL amps myself.
Now if I were to be running vintage AD1s or PX somethings into class A on a daily basis I'd make sure I'd play the stock market right.
Cheers,
Make that a kings' ransom nowadays...glad to see you keep your sense of humour, SY.
Still, it is called that way over here for it's in the eyes of many people the only valid road to sonic bliss.
All in all I tend to agree although I do not always obey, running even less efficient OTL amps myself.
Now if I were to be running vintage AD1s or PX somethings into class A on a daily basis I'd make sure I'd play the stock market right.
Cheers,
Great choice!
I like single-ended amps with a KT88 as driver. (allthough I haven't really tried anything else) I noticed some negative vibes when I mentioned SE-designs but never mind that. They're easy to build and sound great. The only problem is the output-power, but as long as you have fairly sensitive speakers that shouldn't cause any problems.
I like single-ended amps with a KT88 as driver. (allthough I haven't really tried anything else) I noticed some negative vibes when I mentioned SE-designs but never mind that. They're easy to build and sound great. The only problem is the output-power, but as long as you have fairly sensitive speakers that shouldn't cause any problems.
Takashi i think you have made a good choice !
I have been working around one about three years . I use
TFK brand 12ax7 , and original GEC kt88 . In the signal path
lately im very impressed with the accuracy and tonal neutrality
of the Auricaps . In the power supply for smoothing i use 6x
50uf = 300uf with ASC metallized polyprops in oil , sold by Angela
after beeing two years using old oil caps that i take off from
an american war air force RADAR of the fifties . Tantalum resistors
are very good too .
Believe me this amp , well built, can shake your furniture with only
10W . It s y life`s amp , i have another pair of GEC kt88 .
I have been working around one about three years . I use
TFK brand 12ax7 , and original GEC kt88 . In the signal path
lately im very impressed with the accuracy and tonal neutrality
of the Auricaps . In the power supply for smoothing i use 6x
50uf = 300uf with ASC metallized polyprops in oil , sold by Angela
after beeing two years using old oil caps that i take off from
an american war air force RADAR of the fifties . Tantalum resistors
are very good too .
Believe me this amp , well built, can shake your furniture with only
10W . It s y life`s amp , i have another pair of GEC kt88 .
Thats right , Joel ! I am using a large box with early nineties
KEF B200 woofer, no crossover , a Motorola ksn 1025 piezzo ,
solid silver cables , everything DIY .
Maybe at midband things merge a bit , i haven t measured , am
not sure . But i know it sounds good to me . I have been
listening rich men hi-fi for years at stores , i m not ashamed .
Jean Hiraga ! SALUT !
Regards
KEF B200 woofer, no crossover , a Motorola ksn 1025 piezzo ,
solid silver cables , everything DIY .
Maybe at midband things merge a bit , i haven t measured , am
not sure . But i know it sounds good to me . I have been
listening rich men hi-fi for years at stores , i m not ashamed .
Jean Hiraga ! SALUT !
Regards
pw amp
If you are looking at in Hong Kong try this :
http://www.diyaudiocraft.com
Tamura , Iso ( new Tango ) , James ...
Be happy !
If you are looking at in Hong Kong try this :
http://www.diyaudiocraft.com
Tamura , Iso ( new Tango ) , James ...
Be happy !
Hello,
I am interested in building a KT88 single ended, and I want to use a schematic that some of you have already tried:
http://www.bonavolta.ch/hobby/en/audio/kt88_1.htm
That schematic was published at the L'Audiophile magazine in 1980. ¿Do you have more details about it, or do you know where to find that article?
¿Have someone tried the second schematic?:
http://www.bonavolta.ch/hobby/en/audio/kt88_2.htm
This one was published at the book "Build your own Audio Valve Amplifiers" by Rainer zur Linde. I have already ordered that book from amazon, so I will also study this second option when I receive the book.
About the output transformer, ¿do you think the Hammond 1627SE is a good option? hammond
¿What Sowter model is the appropiate one?
Thank you
I am interested in building a KT88 single ended, and I want to use a schematic that some of you have already tried:
http://www.bonavolta.ch/hobby/en/audio/kt88_1.htm
That schematic was published at the L'Audiophile magazine in 1980. ¿Do you have more details about it, or do you know where to find that article?
¿Have someone tried the second schematic?:
http://www.bonavolta.ch/hobby/en/audio/kt88_2.htm
This one was published at the book "Build your own Audio Valve Amplifiers" by Rainer zur Linde. I have already ordered that book from amazon, so I will also study this second option when I receive the book.
About the output transformer, ¿do you think the Hammond 1627SE is a good option? hammond
¿What Sowter model is the appropiate one?
Thank you
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