citation 12 mos fet

[kramskee]

Hi Kannan please PM me your adress and I'll find out for you

thanks

 

[Junm]

Thanks Schubert, just found the facebook page too! .............

Junm boards are $6 for a single channel set

so if you're making stereo amps, $12 gets you 2 driver PCB's and 2 Output PCB's ......... PCB's will be FR4 1.6uM solder masked and component side silk screened for easy component placement. I decided on single sided PCB's since this makes it easier to repair and make any changes or modifications

Prices exclude shipping, I'm forced to use a courier service since our postal system here is unreliable at best

how much shipping cost to the Philippines?

 

[kramskee]

I will let you know

thanks

 

[schubert]

I had Jerry, the fellow who gave me the Citations, over for a listen today, and he confirmed the superiority of the lateral mosfet version - for those of you who might be interested. He was actually surprised to hear a difference at all, but he was unequivocal about his preference for the lateral version.

 

[kramskee]

Hi Everyone,

I have finally received stock of my production run of PCB's for my version of the mosfet 12. For those of you that are interested please PM me with your exact address and I'll let you know how much shipping will be to your location, unfortunately it is country specific.

Junm if you're still interested please PM me your address

 

[Bangla H]

I like the real classic Amp back in live.
Very nice DIY work.

I have send PM.

Really nice restoration Job Schubert.

 

[Nelson Pass]

The 240/9240 version went together like a dream and worked perfectly right off....It's not an M2 or F6 - a little aggressive in the upper midrange (strings), but it has better bass (well, more bass anyway) and more grace under pressure than either.
...
Sound-wise, the lateral version is more even and preferable to the vertical mosfet version. Still not an M2 or F6, but mighty fine.

Depending on whose 9240's you were using, some or all of that could easily
be the "P channel problem" of the IRFs in which the tansconductance
shelves down a few dB from the midrange up and creates distortion.
This is usually dealt with by balanced operation and/or more feedback.

This is why you see the Fairchild parts in the M2.

 

[schubert]

Depending on whose 9240's you were using, some or all of that could easily
be the "P channel problem" of the IRFs in which the tansconductance
shelves down a few dB from the midrange up and creates distortion.
This is usually dealt with by balanced operation and/or more feedback.

This is why you see the Fairchild parts in the M2.

They were Vishay parts in my amp (complementary version). I used the same parts in my M2.

 

[2 picoDumbs]

Can someone characterise the vishay parts for capacitance.
I could probably do it I just need to know the correct procedure with the instrumentation I have access to.

PS. My guess is they are identical to IR parts but that could be wrong.

 

[2 picoDumbs]

I had Jerry, the fellow who gave me the Citations, over for a listen today, and he confirmed the superiority of the lateral mosfet version - for those of you who might be interested. He was actually surprised to hear a difference at all, but he was unequivocal about his preference for the lateral version.

Yeah that is my intent, but I will be going quasi and probably go with the double die laterals.

 

[e_fortier]

Hi,

Is there a place where I can purchase a stereo set of Citation 12 PCB that preferably uses lateral mosfets ? I'd like to one day build such a classic amp.

I really like the layout from Tazz but I believe he's out of spare boards.

Thanks in advance,
Eric

 

[bcbud3]

I would like to know as well. I have the amp already
And am also in Canada. Thanks

 

[schubert]

I'm going to try it with Kramskee's boards. They're not designed for laterals but I think I can make it work. When I get to it I'll post the results.

 

[schubert]

I should note that I'll be building one from the "ground up", so to speak, rather than modifying an existing unit. Using Kramskee's boards in a stock unit might be a problem because they're not really designed for that, though you might be able to do it if you're really clever. For an existing unit the original boards work fine, in my opinion, if you're willing to cut a trace here and solder a capacitor on the back of the board there.

 

[marc brown]

I've been following this topic with interest and some wistful envy. I've got a Citation 12 deluxe that I was going to rebuild with some boards I bought from Tazzz over a year ago. I've got too many other DIY audio irons in the fire (F6, BA3, VFet, ...) and will be listing the Citation and my Tazzz boards in the swap section later this weekend.


Sent from my iPhone using Tapatalk

 

[Nelson Pass]

Can someone characterise the vishay parts for capacitance. My guess is they are identical to IR parts but that could be wrong.

Vishay bought IR as I recall. Last time I looked the parts were the same

 

[schubert]

So where does one find the Harris/Intersil parts? The only supplier I found has a $100 line item minimum (27 pieces). I'd go for half or a third of that if someone else wanted to do the same.

 

[Nelson Pass]

Try Digikey - P channel parts in TO-247 all between $1.70 and 4$ and in stock.

Omit the Vishays if you want to avoid "P channel problem" - still leaves 14 acceptable parts

Transistors - FETs, MOSFETs - Single | Discrete Semiconductor Products | DigiKey

 

[schubert]

OK thanks - I'm still a little timid about substituting parts, but there's only one way to learn....


oooops.......13 of the 14 are N-channel

 

[schubert]

I'm trying to get a handle on which parameters are important for a drop-in replacement for the Vishays. How important is input capacitance? It varies quite a bit among the available P-channels, up to 10x.