VFET Chassis limited production run

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#61
triode_al said:
I had an email with Gianluca, where he states he is interested in the idea of a preamp chassis that matches the V-FET main chassis.
My suggestion is:
  1. 2u high, [or option 1u/2u)
  2. same total width as the front plate (but no heatsinks of course)
  3. Same depth.
  4. Same brushed front finishing. Or at least the same colour of aluminium.
  5. frontplate 2 mm (so knobs can be put on it, selectors, without running in trouble because of a thick 10mm plate where many things would not fit is my experience)
  6. backplate 2 mm, with an array of two lines of 5 holes that are for cinch plugs (for in/out) and if you want balanced, you must increase the size of the hole yourself . . .)
  7. I prefer 2 mm top and bottom aluminium. But could be iron. But needs a line of ventilation. Could match the form of the existing holes (where the top plate is less wide)
  8. well, then alu sides simple plate just finishes it off.
  9. you have to find you own feet 🙂 so they are in line with your requirements.
  10. Holes with matching bolts. . Nothing fancy though.
If there is some interest, I will start another thread, derek, to keep the strain off this thread.
albert
Click to expand...
I would prefer a thicker frontplate, 3 or 4 mm
 
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#62
Or, you could have the matching thickness of the amp’s front plate (it is supposed to be a matching chassis, after all) and Gianluca can mill the back so as to accommodate switches and pots, LEDs, headphones etc such that you simply choose which hole or holes you wish to use and finish the hole with a drill yourself. So what you receive is a flat, no-holes visible front face of the front faceplate and you drill to suit your needs. May be easier to come to a consensus about these ‘starter holes’ on the back face than deciding on a permanent front layout.

I’d like to see the V-FET and V engraving retained - to match the amp.

And the option of a slightly finned pair of sides - again to match the amp.

1 or 2U option would be nice but if it’s too much inventory for Gianluca to carry then 2U.

Feet - matching those supplied with the original offering - should be included. It’s a matching chassis after all🙃

My 2-sense. So far.

Albert, I have no issue with the discussion staying here.
 
#65
Maybe an option: with/without the V-FET "logo" I do have 2SK60 intended for some enlightened stuff or like said LU1014 - so it would fit.

The 4mm frontale plate is one of the standard in use; the normal method then is a "rack mount" side with two screw holes you never use, & which deviates from the look of the front panel. The 10mm has the same structure of the sides. Oh well.
The standard alu covers are 3 mm. Oh well. It is all about weight = cost of material. .
The cost of making holes is 20 holes/panel € 10 ex VAT. Oh well.
 
#68
I would be interested in a matching preamp chassis. And I can make a PCB with the SCG preamp to fit a matching chassis. The SCG does not have a VFET but it does have a triode, made in the Schade. 😉
You could have a follower VFET driven by a triode providing the gain. Triodes all the way.
 
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#69
That would be great RA7 - as long as it gives some 2nd harmonic. It inverts. Too. Which is good.
- I have a tube driver for my V-FeT that gives 20V RMS clean from the 36V power supply (I really mean: >40Vpp). And it is clean, meaning little added signature.
So. I prefer a 2ndH Generator somewhere else . . . somewhere like in a pre.

I saw Gianluca makes prefab holes but also posts (the latter handsome when an iron plate is used).
Yes, I ponder ordering two pre-chassis. You can never have enough.
 
#75
Sidsmith . Look. Of course it depends on the idle current to determine the watts. My Sony SET VFET chassis idles at the given 1.3A and 36V = 50W and has the power supply internal in the box adding 10 watt (90% efficient). It stays internally, cover closed, at 35degrees in a 20 degrees room. It is still warm to the touch after 4 hours.
Gianluca made something nice.
My other build with 2SK182 runs also 1.5A, has 24V, has black 0,3W/c plates but 'feels' warm to hot after 4 hours - the cooling fins are open in the air, so no closed measurement. so . . .

if this can suffice for experiment: I think the Sony SET VFET chassis is very good!
Of course there are people who run the THF51 at 3 amps - well do your guessing. I don't think thát will work in the SET VFET chassis. Then you might consider the higher MonoBlock - Dissipante 5U 500mm 10mm BLACK front panel - 3mm aluminium covers and rear panel
 
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#77
Sidsmith said:
For sake of mid to long term reliability, which option is preferable to dissipate heat : Sony SET VFET chassis or the MonoBlok 4U chassis ?
Click to expand...
I was looking at my monoblock chassis yesterday. It's two separate 4U heat sinks side to side on the long axis for the monoblocks with sinks on only one side. A SIT could be mounted dead center in one of them. It wouldn't make sense to mount it in a way that it was half on one, half on the other. From the looks of the picture of the VFET chassis, the sink is both taller and contiguous. I'm leaning towards a VFET chassis for THF-51S.
 
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#78
A decade long lurker uncloaks...

I won the other set of Sony VFETs (N-channel) at BAF2022, along with a Plitron transformer and the Tokin SITs from the auction. Many thanks to Nelson for donating all the awesome parts and kits, and for so graciously sharing your knowledge and wisdom!

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#79
Thak you all for your answers !

So the VFET chassis will be better, but run as monoblock (dissipate the heat for one amplifier channel only), for any build suggested par M.Pass (Common source or common drain mode) ?

What will be the approximative price for one chassis ?
 
#80
Sidsmith said:
Thak you all for your answers !

So the VFET chassis will be better, but run as monoblock (dissipate the heat for one amplifier channel only), for any build suggested par M.Pass (Common source or common drain mode) ?

What will be the approximative price for one chassis ?
Click to expand...
The VFET chassis isn't really set up to be a monoblock as it has heatsinks on both sides. You'd be wasting the sink on one side if you used it as a monoblock. The monoblock chassis described above is a separate item, a part number that was temporarily on offer earlier this summer. Completely different form factor.
 
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