Revenge is Mine!

[jean-paul]

Power amp OUTPUT STAGE measurements shootout

Tim de Paravicini has passed away:

Tim de Paravicini, RIP | Stereophile.com

 

[jotom750]

"from my perspective , both ways are placing equal challenge to constructor ........ and results are product of one's capabilities

by some criteria, all amps should be made with Kosher "Power Amplifier Application" devices ..... be it bjt or 300B or puny 2SJ/2SK"

Thank you ZM. Though some here may find that statement obvious (I do not). It's a real "Light Bulb" one for me. It is so easy to forget the basics and just add more "stuff" to work around a problem or a components deficiencies, because sometimes we may have become "blinkered". (That does not mean I'll sell my Tokins, but just may use other things instead) 🙂

 

[haiqu]

I don't feel need to champion neither VT4C (your Ongaku) nor Tokin elevator sand containers

just sayin' that it seems that you're showing some double standards .....again - Ongaku - it's output parts ( both VT4C and gargantuan OPT) vs. Tokin sand containers

Well, I never claimed to be consistent. On the other hand, I don't actually own an Ongaku, the presentation was far too coloured for my liking despite the oohs and aahs from the cognescenti.

I do own one rather modest valve amplifier sporting KT88 outputs, and have yet to plug it in. I bought it in a moment of nostalgia, and as they say, "Nostalgia ain't what it used to be."

by some criteria, all amps should be made with Kosher "Power Amplifier Application" devices ..... be it bjt or 300B or puny 2SJ/2SK

No pork in any of my designs. 😛

 

[haiqu]

What an unfortunate name and font choice. Took some squinting to see they weren’t called Moronic.

You sure it isn't Masonic? I smell a conspiracy here.

 

[haiqu]

Clearly those comments were designed to wind people up. As I've already stated twice, I've never heard a VFET amplifier. However, I have two reference amplifiers that I can compare it to when it arrives:

These were your words...
"It is a beast. It is the holy grail of VFET amps, Unobtainium to the power X.
Now I have to wait a whole week for delivery. :-("

I simply assumed that you had a reason for saying that, is that wrong? I'll say no more on the matter.

It was pure hyperbole, in keeping with the theme of this thread. After all, did you really believe I had sold "an arm, a leg and a testicle" for this amplifier?

 

[haiqu]

That's lower than the IHF standard input figure at 10 nF. Not much of a problem.

BTW not sure if you were joining in the levity there or just made an error. Isn't the standard 1 nF? The Tokin 2SK180 exceeds that by a factor of 2.5 and many of the other Tokin parts by a factor of 8.

Yes, I realise that it's easy enough to add a buffer (a la "The Beast") but it's inelegant. Eventually I may come around to your "big horns, small Class A" school of thought, since I bought an old Post Office in the country in which to spend my retirement (see below) that has a space with 10,000 cu ft volume like your listening room. But I haven't been here very long and it's still a bit of a clutter.

But horns made out of MDF still don't have the cachet of the old Klipsch, which were built by shipwrights by the looks of them.

 

[Zen Mod]

well, in the end (or beginning) - all it matters is what suits you most

best approach is where green is broadest

🙂

 

[haiqu]

well, in the end (or beginning) - all it matters is what suits you most

best approach is where green is broadest

🙂

The broad green hasn't been in hi-fi since the late 70s. :-(

 

[Nelson Pass]

BTW not sure if you were joining in the levity there or just made an error. Isn't the standard 1 nF?

You're right! And all these years I've been laboring to drive 10,000 pF.



I will point out that in Common Drain mode the Gate to Source capacitance doesn't look like 8,000 pf.

 

[haiqu]

You're right! And all these years I've been laboring to drive 10,000 pF.



I will point out that in Common Drain mode the Gate to Source capacitance doesn't look like 8,000 pf.

So, you appear to be advocating followers. Appropriate for a guru.

 

[Nelson Pass]

I checked actual test for THF-51s, and got 1 nF effective input capacitance
operated Common Drain.

 

[haiqu]

I checked actual test for THF-51s, and got 1 nF effective input capacitance operated Common Drain.

Well, at AU$100 odd that's a better proposition. I truly wish I could go someplace and hear one of these things running to find out if it's worth the trouble though. I can get 35W out of a cheap pair of JFETs in class A with off-the-shelf power trannies, so it would have to be pretty spectaular.

 

[Soundhappy]

It is a beast. It is the holy grail of VFET amps, Unobtainium to the power X.

Now I have to wait a whole week for delivery. :-(

Many holy grails on this forum 😉 Diy builds for me 😀
Sony TA-N7B Vfet are " quasi mono blocks "

 

[Soundhappy]

When new, the Victor JM-S7 sold for JPY 230,000 and they're not all that much cheaper today. Heck, I've built 100W/ch amps for less than I paid for the 100V stepdown transformer. I sure hope it was worth it.

If possible try find the same Nec Vfet's for spares..
..avoid fakes

 

[R-K Rønningstad]

I know audio amplifiers examples with all models of Tokin Sit's.

Japanese audio industry Maxonic brand creates commercial products with them so logicaly they are good..
😀 four 2SK182 ES inside for stereo

Do we know the circuit diagram of the Maxonic SD-016 and/or the Victor (JVC) JM-S7?

 

[haiqu]

If possible try find the same Nec Vfet's for spares..
..avoid fakes

At $200+ each, I'd say that if it dies it's not worth repairing. A failure would likely take out four devices in a single hit. I haven't yet seen a reliable source of spares either.

It's a risk I'm willing to take, but I will be doing a thorough inspection.

 

[haiqu]

Do we know the circuit diagram of the Maxonic SD-016 and/or the Victor (JVC) JM-S7?

The JM-S7 circuit isn't available. I don't particularly care about the Maxonic, it looks fairly nasty to me.

 

[haiqu]

Many holy grails on this forum 😉 Diy builds for me 😀
Sony TA-N7B Vfet are " quasi mono blocks "

Yes, they're very nice. I almost bought a TA-F7 from a guy in Germany before finding the Victor. He just didn't get back to me fast enough.

Unfortunately the cheapest TA-N7B I've seen lately was EUR 3,999.00 + shipping.

 

[V FETish]

"Unfortunately the cheapest TA-N7B I've seen lately was EUR 3,999.00 + shipping."


The Sony TA-N7B is certainly a magnificent piece of work. That said, I wouldn't trade my JM-S7 for it. Why, the Victor is pure V-FET output bliss where the N7B isn't due to the cascoded output BJT's.

 

[hpro]

"Now I have to wait a whole week for delivery. :-("

Not off Ebay I hope, people are finding bricks turning up instead of goods !
I got a lump of wood instead of an amplifier.

Ebay, the place the crooks having fun making money for nothing...
I'm not buying on ebay for a long time..
Greetings..
Chris