Elecraft › [HAM]

Part substitution & transistor/FET spec list

Classic

List

Threaded

6 messages Options

Kevin Rock

Part substitution & transistor/FET spec list

I am working my way through Wes Hayward's book "EMRFD" along with Doug DeMaw's book "W1FB's QRP Notebook" and am creating a new part order. Yes, I will receive discrete parts for my Christmas present. Since I needed something to put under the tree a nice box from Mouser would look just fine. However, I have run into an impasse. I need some 2N4416s and some BB104s and find them either as scarce as hen's teeth or dear enough to make Croesus cringe. Thus my request from this auspicious group. Audacious may be more accurate :) but I digress. Long ago (circa 1969) I had a manual for substitutions of various transistors. Said manual held substitution charts and specs for a variety of bipolar transistors. I was wondering if there are any online sources of material similar to this manual. Barring that could anyone offer some available and inexpensive (think cheap, I am a radio amateur and there are traditions to uphold!) parts which would fit into the circuits I am trying t
o craft without too much bias fiddling, reactance matching, or other such work arounds. I have some BB105s on the way from W0EB but they do not have the range of the BB104s (24 - 42 pF as compared to ~1.8 - 2.8 pF) Varactors seem to be getting as scarce as the old fashioned variable capacitors unless one wants SMT. Soon I will be using more SMT but for now I would like to have larger parts.

My queries:
1) A varactor with a range similar to the BB104 in a leaded form. If leaded is not available I will go with SMT.
2) Lists of transistors and FETs with fT and power ratings, etc. I want to explore VHF and UHF VFOs even though I do not hope to tame one. Much like tilting at windmills impossible challenges are interesting and pleasurable pursuits. I am not mad (at least that is what the voices told me :)
Thank you for any assistance offered.
73,
Kevin. KD5ONS
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

Bill Hammond

Re: Part substitution & transistor/FET spec list

Usually a quick Google search will return several choices. Search for
"2NXXXX substitution". I tried it and got several choices. You can
usually search for the exact device and get the entire specification
to compair.
73,
AK5X

Sent from my iPhone

On Dec 8, 2009, at 2:00 PM, Kevin Rock <[hidden email]> wrote:

> I am working my way through Wes Hayward's book "EMRFD" along with
> Doug DeMaw's book "W1FB's QRP Notebook" and am creating a new part
> order. Yes, I will receive discrete parts for my Christmas
> present. Since I needed something to put under the tree a nice box
> from Mouser would look just fine. However, I have run into an
> impasse. I need some 2N4416s and some BB104s and find them either
> as scarce as hen's teeth or dear enough to make Croesus cringe.
> Thus my request from this auspicious group. Audacious may be more
> accurate :) but I digress. Long ago (circa 1969) I had a manual for
> substitutions of various transistors. Said manual held substitution
> charts and specs for a variety of bipolar transistors. I was
> wondering if there are any online sources of material similar to
> this manual. Barring that could anyone offer some available and
> inexpensive (think cheap, I am a radio amateur and there are
> traditions to uphold!) parts which would fit into the circuits I am
> trying t
> o craft without too much bias fiddling, reactance matching, or other
> such work arounds. I have some BB105s on the way from W0EB but they
> do not have the range of the BB104s (24 - 42 pF as compared to ~1.8
> - 2.8 pF) Varactors seem to be getting as scarce as the old
> fashioned variable capacitors unless one wants SMT. Soon I will be
> using more SMT but for now I would like to have larger parts.
>
> My queries:
> 1) A varactor with a range similar to the BB104 in a leaded form.
> If leaded is not available I will go with SMT.
> 2) Lists of transistors and FETs with fT and power ratings, etc. I
> want to explore VHF and UHF VFOs even though I do not hope to tame
> one. Much like tilting at windmills impossible challenges are
> interesting and pleasurable pursuits. I am not mad (at least that
> is what the voices told me :)
> Thank you for any assistance offered.
> 73,
> Kevin. KD5ONS
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

Steve Finch

Re: Part substitution & transistor/FET spec list

I use the NTE Electronics cross reference. I find that many transistors can
be substituted by several alternatives.

http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search?OpenForm

Steve Finch, AIØW
Bailey, CO
[hidden email]

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Bill Hammond
Sent: Tuesday, December 08, 2009 2:01 PM
To: Kevin Rock
Cc: [hidden email]; [hidden email]
Subject: Re: [Elecraft] Part substitution & transistor/FET spec list

Usually a quick Google search will return several choices. Search for
"2NXXXX substitution". I tried it and got several choices. You can
usually search for the exact device and get the entire specification
to compair.
73,
AK5X

Sent from my iPhone

On Dec 8, 2009, at 2:00 PM, Kevin Rock <[hidden email]> wrote:

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

alorona

Re: Part substitution & transistor/FET spec list

In reply to this post by Kevin Rock

> I need some 2N4416s and some BB104s and find them
> either as scarce as hen's teeth or dear enough to make
> Croesus cringe.

Kevin brings up good points. (Probably any general purpose FET will work, Kevin.) For a real challenge, try finding a dual-gate MOSFET such as the 40673 which used to be ubiquitous. Moreover, for a few years I have been hearing threats of the demise of the 2N2222 transistor... I can't imagine a world without 2N2222s!

And yet, the lowly 1N34 germanium diode is still going strong. Why is this notable? I have a 1953 QST article of an antenna tuner designed by George Grammer which used a 1N34 in its circuit. That was almost *60 years ago* but you can still buy 1N34s at your local electronics store. That's pretty amazing. What other semiconductor (or vacuum tube, for that matter) has lasted that long?

Al W6LX
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

n7ws

Re: Part substitution & transistor/FET spec list

http://store.americanmicrosemiconductor.com/1n21.html?gclid=CJnj39KAyJ4CFSUsawodg32mrA

--- On Tue, 12/8/09, Al Lorona <[hidden email]> wrote:

What other semiconductor (or vacuum tube,
for that matter) has lasted that long?

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

Ross Primrose N4RP

Re: Part substitution & transistor/FET spec list

In reply to this post by alorona

Al Lorona wrote:
> And yet, the lowly 1N34 germanium diode is still going strong. Why is this notable? I have a 1953 QST article of an antenna tuner designed by George Grammer which used a 1N34 in its circuit. That was almost *60 years ago* but you can still buy 1N34s at your local electronics store. That's pretty amazing. What other semiconductor (or vacuum tube, for that matter) has lasted that long?
>
The 12AX7 has been around since 1947, and is still in production in
multiple countries...

73, Ross N4RP

--
FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.”

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html