Technically you don't need 28V rails. To quote from the last page of the DIY Sony VFET article:
So it can be made to work with 24V rails, which is what you'd be getting from 18V secondaries.
So it can be made to work with 24V rails, which is what you'd be getting from 18V secondaries.
well , making uberultimate gadget , and skimping on few greenies , for custom Donut jobbie ?
not good ..........
not good ..........
...yep...so you got last chance of using these amazing devices...with full Papa backing and support...and then you skimp on the trafo ??????
nonsense...sorry in my frankness offends you, but i personally don't see any sense in doing anything but exactly what NP in his generosity gave us.
..my 2c
Normally I would be one to say adapt to what you have (within reason). We
are, after all, not just DIY'ers, but fearless amplifier builders. 🙂
However, the unique nature of this project means to me that I should
work to not compromise its performance.
To give a bit of motivation, I have had opportunity to listen to a dual-pair
version of the VFET2 amp and it really is quite remarkable. It has certainly
given me impetus to build the single-pair kit to recreate some of that magic,
even though I'm not so hot with a soldering iron any more. 🙁
And let's not forget what it took to bring this project to fruition. With the
number of Vfets in the kits, Papa could have done a limited production run,
or build more Sony 40th anniversary amps. Instead, he has given us this
most wonderful gift.
We've come this far; let's finish the journey together.
Dennis
are, after all, not just DIY'ers, but fearless amplifier builders. 🙂
However, the unique nature of this project means to me that I should
work to not compromise its performance.
To give a bit of motivation, I have had opportunity to listen to a dual-pair
version of the VFET2 amp and it really is quite remarkable. It has certainly
given me impetus to build the single-pair kit to recreate some of that magic,
even though I'm not so hot with a soldering iron any more. 🙁
And let's not forget what it took to bring this project to fruition. With the
number of Vfets in the kits, Papa could have done a limited production run,
or build more Sony 40th anniversary amps. Instead, he has given us this
most wonderful gift.
We've come this far; let's finish the journey together.
Dennis
be cool ....... you didn't said anything you're not entitled to say .......
we are speaking generally - about voltage being pretty much optimized , and it'll be pitty to make this gem cutting any corner
we are speaking generally - about voltage being pretty much optimized , and it'll be pitty to make this gem cutting any corner
a bit late to the party. very exciting! I almost regard building a VFET amp a tribute to Papa whose support is beyond anything one could have expected.
my only issue is that I have no use for anything under 30-35W into 8ohms (and a bit more into 4).
maybe Jason can put me at the bottom of the list? if there are vfets left after the kits have been sold, I would not mind building the original version with two pairs per channel if possible. thanks 🙂
my only issue is that I have no use for anything under 30-35W into 8ohms (and a bit more into 4).
maybe Jason can put me at the bottom of the list? if there are vfets left after the kits have been sold, I would not mind building the original version with two pairs per channel if possible. thanks 🙂
Maybe get some different speakers for this amp??? (provided you can build either version).
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I already have BA-3b monoblocks 😀. currently tuning the distortion pots on those. I will post that update soon in the appropriate thread.
I would not mind trying a double vfet version though with my Elsinores (Aleph30 at 25.5V rails was able to run those with superb vocals; a bit loose on the bass but manageable with an AlephP in the front).
I would not mind trying a double vfet version though with my Elsinores (Aleph30 at 25.5V rails was able to run those with superb vocals; a bit loose on the bass but manageable with an AlephP in the front).
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what I think would be appropriate for all the effort Papa has been putting into this one:
DIYkits could include a front face plate for Hifi2000 chassis with engraved "passdiy VFET", in the letter style consistent with pass art (I always wanted one of those nice facias after all the ugly housings with nondescript fronts I had made from scratch).
if I luck out and get those four pairs of vfets I may just have one made this time around 😎.
DIYkits could include a front face plate for Hifi2000 chassis with engraved "passdiy VFET", in the letter style consistent with pass art (I always wanted one of those nice facias after all the ugly housings with nondescript fronts I had made from scratch).
if I luck out and get those four pairs of vfets I may just have one made this time around 😎.
Koja,
A customized front plate would be pretty cool. Also,
in case you've missed it, here's a big vfet amp in progress:
http://www.diyaudio.com/forums/pass-labs/296369-vfet-x-my-1-3-40th-anniversary-sony-vfet-clone.html
Dennis
A customized front plate would be pretty cool. Also,
in case you've missed it, here's a big vfet amp in progress:
http://www.diyaudio.com/forums/pass-labs/296369-vfet-x-my-1-3-40th-anniversary-sony-vfet-clone.html
Dennis
I think if you have a preamp balance output connect direct to two single pair will better unbalance connect to two pair version🙄
Hello Mr Pass, I am sorry to bother you but I have followed the Vfet story for many years and I would like your opinion/guidance.
I have been away from the forums and missed the Vfet kit that was for sale.
I however own two TAN-5550 amplifiers along with a TA-5650 integrated and a TA-4550.
So I have Vfets to spare.
I have settled on Quad 57s for my relatively small listening room (11'x20'x8' ceiling)
I am presently driving them with Ocellia 300B SET amplifiers and as you can imagine I have great sound but a little lacking in overall output.
My question to you is, since I cannot get the kit would you recommend that I rebuild the TAN 5550 with all new refreshed components even though I do not need a quarter of the power it produces or do you have another suggestion for building something like the kit that was offered.
I have 7watts now with the SET monoblock amps but 10 to 15 watts would be the sweet spot.
My problem is I am very good with the soldering iron and electrical principles but I lack the patience to do anything outside of the box, like designing my own breadboard and doing point to point work. Nor do I really have the spare time to hunt down all the parts.
I do not require, nor want to rebuild the integrated Sony amps as there is just too many circuits that get in the way of the sound.
I use a passive pre amp with Seidon Attenuators all populated with Charcroft naked resistors, so simple circuits are preferred.
The easiest would be to rebuild the TAN 5550 but there is just so much going on inside that amp that all I can see is lost music in all those boards and components and wasted energy powering up unused potential.
I think your kit would have been perfect for my needs but there is nothing of the kits left, due to the Vfets needed to go with the kits.
Anyway, I thank you greatly if you have read this message and would be most humbled if you had any thoughts or guidance to pass along.
Have a great day!
I have been away from the forums and missed the Vfet kit that was for sale.
I however own two TAN-5550 amplifiers along with a TA-5650 integrated and a TA-4550.
So I have Vfets to spare.
I have settled on Quad 57s for my relatively small listening room (11'x20'x8' ceiling)
I am presently driving them with Ocellia 300B SET amplifiers and as you can imagine I have great sound but a little lacking in overall output.
My question to you is, since I cannot get the kit would you recommend that I rebuild the TAN 5550 with all new refreshed components even though I do not need a quarter of the power it produces or do you have another suggestion for building something like the kit that was offered.
I have 7watts now with the SET monoblock amps but 10 to 15 watts would be the sweet spot.
My problem is I am very good with the soldering iron and electrical principles but I lack the patience to do anything outside of the box, like designing my own breadboard and doing point to point work. Nor do I really have the spare time to hunt down all the parts.
I do not require, nor want to rebuild the integrated Sony amps as there is just too many circuits that get in the way of the sound.
I use a passive pre amp with Seidon Attenuators all populated with Charcroft naked resistors, so simple circuits are preferred.
The easiest would be to rebuild the TAN 5550 but there is just so much going on inside that amp that all I can see is lost music in all those boards and components and wasted energy powering up unused potential.
I think your kit would have been perfect for my needs but there is nothing of the kits left, due to the Vfets needed to go with the kits.
Anyway, I thank you greatly if you have read this message and would be most humbled if you had any thoughts or guidance to pass along.
Have a great day!