Sony vFET Amplifier Part 2

[Zen Mod]

question and answer , in same post ?

ask for just pcbs from Store , use VFets from Sony amps

 

[Tedman]

Thanks for responding.

I looked at the store and as far as I can tell the boards are not available. I assumed they probably ordered the number of boards to go with the number of Vfets that were available?

I will leave a request and see what happens.

Thanks very much!

 

[Rodeodave]

There might also be some of these pcbs left:

http://www.diyaudio.com/forums/group-buys/285823-gb-pass-sony-vfet-version-2-al-boards-tea-bag.html

 

[Variac]

Nelson said he has even more VFETs, so you'd better quickly sign up on the list for an Essentials Kit, which includes the VFETs!

Then if you're lucky, there may be a Supplemental Kit still not spoken for which supplies all the remaining circuit board parts.

.................
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.

Have a great day!

 

[bk856er]

Roll Call - how many diyA VFET builds completed as of 11/12/16?

- bk856er

 

[koja]

I think if you have a preamp balance output connect direct to two single pair will better unbalance connect to two pair version🙄

I have an extra AlephP sitting around and for the added gain it is a tempting idea.

I am not sure what running bridged single pair versions would add up to in terms of noise and sound? it is a consideration as these would not be cheap.

also what is a heat output of one single pair? for sizing the housing.

 

[Zen Mod]

read article , find raw DC voltage per rail , find Iq , multiply , double (two rails)

easy

so ...... xformer 22Vac per rail , so approx. 1.25 that for Vdc

sorta 28Vdc per rail

Iq around 1A

so , (28Vdc x 2 ) x 1A ......... means 56W of heat ,per channel

 

[Studley]

Nelson said he has even more VFETs, so you'd better quickly sign up on the list for an Essentials Kit, which includes the VFETs!

Then if you're lucky, there may be a Supplemental Kit still not spoken for which supplies all the remaining circuit board parts.

When the final batch of Essential kits is made available, is it the intention that there will also be a corresponding batch of supplemental kits available to go with them?

 

[nagini262]

I help my friend build another Sony VFET P2🙄
He design and build the chassic, I help him build all other parts inside. This is really a good chassic with Fischer Elektronik heatsink, 15mm front panel, others panel are black anodised and especially the big bracket created by CNC, I was very surprise at the first time I see this bracket😱

 

[Eric]

What a beauty! Looks like is passes the Class A "size and weight test" for sure 😀

 

[Dennis Hui]

Very nice! I see you use the Hammond 159EZ choke in your builds. I should
give that a try if I get a chance.

The Papa design PCB...fantastic...and the bracket is really something

I guess the XLR only has the positive phase hooked up?

Dennis

 

[wdecho]

Fantastic build.

 

[Joca]

Insane! Got to have one!

 

[Zen Mod]

Fugly!

 

[WalterW]

Fantastic!

 

[WBS]

Fantugly!

 

[Eric]

Just taking a second look at your images, do the boards with your caps provide enough clearance to allow for air circulation for the rectifier sinks below?

 

[ichiban]

XFMR Group Buy

Interesting Group Buy for transformers here ...

http://www.diyaudio.com/forums/grou...on-300va-4x18vac-transformer.html#post4838321

 

[Dennis Hui]

Two transformers, two fuses?

I have a construction question. If one is to use two transformers in
a single chassis, should the transformers be fused individually? (My
first thought is that you should.)

Thanks,
Dennis

 

[grimberg]

In my way of thinking, if there is ANY problem in the amplifier, I don't want any part of it energized. I have been using two transformers in my First Watt clones (Aleph J, F4, F5, F6, M2) and only one fuse.