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 Post subject: RCA 40673 dual mosfet
PostPosted: Jan Tue 08, 2013 12:20 am 
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Joined: Sep Sat 17, 2011 7:03 pm
Posts: 130
Location: Sheridan,Wy., 82801
Is there a direct replacement for the 40673 out there somewhere? Someone must still make one! Lenny


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 Post subject: Re: RCA 40673 dual mosfet
PostPosted: Jan Tue 08, 2013 1:00 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 193
Location: Wayside, NJ Monmouth
Try Dans Small Parts " www.danssmallpartsand kits.com " he may have NOS units.


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 Post subject: Re: RCA 40673 dual mosfet
PostPosted: Jan Tue 08, 2013 1:34 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 21000
Location: Maryland, USA
N2LXM wrote:
Try Dans Small Parts
Dead domain.

He apparently let the domain registration expire.

Some broker picked up the home page and that's all. Name is for sale.

- Leigh

_________________
73 de Leigh W3NLB
http://www.AtwaterKent.info
Click "Grebe Stuff" for Synchrophase info


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 Post subject: Re: RCA 40673 dual mosfet
PostPosted: Jan Tue 08, 2013 1:47 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 15407
Location: Somers, CT
He's been selling out stock on eBay... this is his latest webpage with the final closeouts.

http://danscloseoutsandspecialdeals.com ... overs.html


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 Post subject: Re: RCA 40673 dual mosfet
PostPosted: Jan Tue 08, 2013 2:27 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 193
Location: Wayside, NJ Monmouth
Click on the link at the top of the page. He is not going out of business, this is just his close out page.


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 Post subject: Re: RCA 40673 dual mosfet
PostPosted: Jan Wed 09, 2013 12:22 am 
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Joined: Apr Sat 09, 2011 11:53 pm
Posts: 335
Location: Montreal. Canada.
[quote][Is there a direct replacement for the 40673 out there somewhere? Someone must still make one! Lenny


/quote]

NTE222 is supposed to be an equivalent.
David.


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 Post subject: Re: RCA 40673 dual mosfet
PostPosted: Jan Wed 09, 2013 4:26 am 
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Joined: Jun Tue 21, 2011 8:27 pm
Posts: 2819
Location: Virginia
Got a 40673 in my junkbox, but I'm keeping it to repair a HW-7 I have.
There's a few on eBay which are waaaaaay too expensive.
If I find one or two for a reasonable price I'll let you know.

~ Mitch ~

P.S. - Isn't the 2N311 an equivalent? Something about that number rings a bell.
Maybe I'm just trippin'.


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 Post subject: Re: RCA 40673 dual mosfet
PostPosted: Jan Wed 09, 2013 6:20 am 
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Joined: Jan Tue 16, 2007 7:02 am
Posts: 814
Location: Lexington, KY USA
If you can use an SMT part, NXP devices are still available through distribution at reasonable prices. Mouser and Avnet have these.

If it's for a repair, you might solder one (tiny!) lead to a PCB land, then run 30 ga wires for the other connections.

Ted


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 Post subject: Re: RCA 40673 dual mosfet
PostPosted: Jan Wed 09, 2013 5:01 pm 
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Joined: May Tue 30, 2006 4:46 pm
Posts: 5724
Location: Santa Rosa, CA
Quote:
Isn't the 2N311 an equivalent? Something about that number rings a bell.
Maybe I'm just trippin'.


I think you mean 3N211? A dual-gate FET has 4 connections, therefore is a "3N" number.

Rich
http://www.dz863.com/datasheet-83832128 ... Depletion/


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 Post subject: Re: RCA 40673 dual mosfet
PostPosted: Jan Wed 09, 2013 5:03 pm 
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Joined: May Tue 30, 2006 4:46 pm
Posts: 5724
Location: Santa Rosa, CA
You might find some Japanese parts... they made the 3SK series of dual-gate FETs.

http://www.mcmelectronics.com/product/6 ... rodKeyWord

Rich


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 Post subject: Re: RCA 40673 dual mosfet
PostPosted: Jan Wed 09, 2013 5:13 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 15407
Location: Somers, CT
Rich, W3HWJ wrote:
Quote:
Isn't the 2N311 an equivalent? Something about that number rings a bell.
Maybe I'm just trippin'.


I think you mean 3N211? A dual-gate FET has 4 connections, therefore is a "3N" number.

Rich
http://www.dz863.com/datasheet-83832128 ... Depletion/


Yep, and they probably might make a good sub for the 40673 RCA dual gate. Dan's Small Parts has them in stock.

Pete


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 Post subject: Re: RCA 40673 dual mosfet
PostPosted: Jan Thu 10, 2013 2:36 am 
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Joined: Jun Wed 08, 2011 2:33 am
Posts: 3218
Location: Ohio 45177
I would go with the 3N201, maybe. That and the 40673 were used to supposedly upgrade the front end performance(gain?) of many Yaesu transceivers by modders, and seemed to have accomplished practically identical results. I am sort of hoarding my US made type dual gate mosfets with standard leads, instead of SMD. Getting harder to find, cheap. But it may also depend on the freq. range you need it for, HF, VHF, UHF. Mixer or RF Amp. Etc. Like, you don't need the lowest noise for the mixer, I don't think, but still get the characteristic improvements over a bipolar mixer.


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 Post subject: Re: RCA 40673 dual mosfet
PostPosted: Jan Sat 12, 2013 7:41 pm 
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Joined: Dec Mon 20, 2010 5:14 pm
Posts: 324
Location: Central Pennsylvania
About two years ago I spent a lot of time trying to find a vender and part number for a dual gate MOSFET in current production- preferably leaded for a day job design requirement.
I came up basically empty-handed. I could fine no currently produced dual gate RF fet and could fine only a small number of current production surface mount devices.

I wondered how this could be and came up with the following conclusion.
Most dual gate RF FETS seemed to have been design for and used for AGCable front ends in TVs and FM radios. These have been replaced by integrated circuit front ends or entire receivers/tuners on a chip. For this reason these useful parts no longer have a significant OEM market and have been widely discontinued.

There is an opportunity for someone to come up with a small daughter board with a still available SM Dual gate fet that inserts nicely into the old fashion 4 lead 40673 type pcb footprint. The daughter board most likely would need some additional SM passive components to limit the UHF response of the SM fet in order to tame the UHF spurious osc that can be expected to be induced by the inductance of the leads.


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