The ultimate DIY? A Stax SRM-T2!

[guzziguy]

It's a good thing that you are a rich doctor.

[Milosz]

Rich-Tech Parts, up in Richmond B.C., claims to have GENUINE Hitachi 2SK216's...

http://richtechparts.com/i-3333-2SK216.html

[Milosz]

UT-Source quoted me $2 each plus $8 total shipping for a small order

http://www.utsource.net/

They sent a picture, hard to tell from the picture... might look OK, hard to see...

[livewire]

UT-Source quoted me $2 each plus $8 total shipping for a small order

http://www.utsource.net/

They sent a picture, hard to tell from the picture... might look OK, hard to see...

Picture looks correct but.............................See post #2405.

Edited September 2, 2011 by livewire

[Inu]

2SK216 = @231JPY in Japan. $2 each is good deal!

Date Code = 2W5

Hitachi’s date code format: A (Jan) … L (Dec) ... W( )

[kevin gilmore]

mcm electronics had real 2sk216, but now out of stock, 81 days delivery.

they don't stock the 2sj79

[cobra_kai]

bdent still has stock of 2sj79 but they are stupidly expensive... 8.82 each

[Kerry]

I used MCM to source some K216s and they were legit. I bought a 10 of the J79s from BDEnt. Interestingly I got 10 pairs. I was going to order some of the K216s, but then they ran out. Summer sale I think

On another note...

I've been playing with designing an SS front end and I've posted my first component (active batteries) in the T2 design and other circuitry thread. I'll keep my progress of this in the other thread.

For anyone interested here's the link:

[Inu]

I have no idea that use semis for first stage is good or bad for the sounds.

Article from MJ 1995/5 (Page 37)

---------------------------------------------

“The first stage is a cascaded differential circuit that uses two 7308 tubes that are equivalent to the 6DJ8. A transistor constant current source was added to both the plate load and the cathode. The supply voltages for this differential circuit are +250V and -600V.

The reason tubes are used for the first stage is to avoid thermal related parameters. If semiconductors were used in this circuit, the junction temperature would be influenced by the current. It would be easy to unbalance the differential circuit when the current changes. However by using tubes, the temperature is already biased by heaters so regardless of changes in current, the operating parameters will be very stable. These tubes are covered by metal shielding caps.”

[Inu]

Sorry, I should have posted on the "Discussion on the design of the T2 & other circuitry"

[Kerry]

Sorry, I should have posted on the "Discussion on the design of the T2 & other circuitry"

Posted response on the other thread

[Milosz]

Picture looks correct but.............................See post #2405.

Ahhh. Thanks.

I ordered my 2SK216's from Rich-Tech Parts of B.C., they're Canadian, so it's got to be OK, eh?

We'll see.

[Milosz]

Here's a volume control knob that might be useful to keep the curious away....

[cobra_kai]

Hmmm I think the k216 I got from bdent may be fakes... If Inu is correct about the date codes the ones I have use a date code of M, which would be that new month after december when we switch to a lunar calendar. Here is a picture:

[ujamerstand]

Those are genuine Renesas devices I believe.

[deepak]

Genuine 2sc3675 in case anyone was wondering...

[n3rdling]

Just to be clear, are those from MCM or the distributor you were referring to earlier?

[Inu]

Those are genuine Renesas devices I believe.

Yes, it is genuine Renesas FET. I am using same one in my T2.

[cobra_kai]

Those are genuine Renesas devices I believe.

Yes, it is genuine Renesas FET. I am using same one in my T2.

Thanks guys that is good to know. Now I just wish I had bought more of them, I wasn't expecting them to be so hard to come by.

[kevin gilmore]

speaking of fakes...

WARNING TO ALL...

http://gilmore.chem....du/dsc_2288.jpg

The one on the left is real, the one on the right is fake, and breaks down at 200 volts.

birgir and i got nailed on this, about half of the ones i bought were fake, and most of

birgir's (if not all of them) are fake.

Evidently there are also 2sa1486 fakes out there, i don't have any pictures of the

fakes.

Get yourself one of these

http://www.ebay.com/...=item1c1d98666e

and test all the high voltage transistors before you put them in.

[blubliss]

My goodness that guy has a ton of negative feedback, didn't see any concerning this device. Did you order one from him Kevin?

Edit: Nevermind, found many more sellers.

Edited September 6, 2011 by blubliss

[n3rdling]

Anybody know where I can source 2SA1486 besides littlediode?

[digger945]

My goodness that guy has a ton of negative feedback, didn't see any concerning this device. Did you order one from him Kevin?

Edit: Nevermind, found many more sellers.

I have had one for about 6 months now. I got it from this seller because of the combined cost with shipping and his 100% feedback.

http://myworld.ebay.com/jenny285123/&_trksid=p3984.m1439.l2754

It takes a little bit to figure out exactly how to use it, but it works pretty good for most stuff, and tests Vbr to about 1200v+

[deepak]

I purchased my 2SA1486 from BDent, fingers crossed they are genuine.

[cobra_kai]

I have had one for about 6 months now. I got it from this seller because of the combined cost with shipping and his 100% feedback.

http://myworld.ebay....984.m1439.l2754

It takes a little bit to figure out exactly how to use it, but it works pretty good for most stuff, and tests Vbr to about 1200v+

Just picked one up, would you mind posting some tips on how to use it if it is not straightforward?