Hi Michael,

msg wrote:

I wouldn't mind seeing that article too...

if your address (minus underscores) is a valid one, you have mail


in the '80s I built some common type replacements using jfets and
bipolars and installed them in an HP scope.....

I think that we all may want to learn the knack: in a near future this
will probably be the only way to refurbish tube equipment...

Regards,
--
73 es 51 de i3hev, op. mario

Non è Radioamatore, se non gli fuma il saldatore!
- Campagna 2006 "Il Radioamatore non è uno che ascolta la radio"

it.hobby.radioamatori.moderato
http://digilander.libero.it/hamweb
http://digilander.libero.it/esperantovenezia

Pete KE9OA Wrote:

Does anybody have a copy of the April 1977 QST?
The article I am interested in the the one by
Howard Sartori, entitled
"solid tubes, a new life for old designs".


Pete, the last time I did this, I had dual gate MosFET devices. These
days they are harder to find, so I'd probably use two JFETs in cascade to
get more or less the same effect.

I vaguelly remember the article recommends dual gate MosFETs but I will
admit, it's been a long time since I read it.


Jim Pennell
N6BIU


--

21:55 Pacific Time Zone
Jan 14 2008

International Time
05:55 UTC
15.01.2008

I will give it a whirl. I do have some of the dual gate devices on hand. I
have to do a board layout for each of the modules, that will have a pin
field that has the same pattern as the tube base. Out of all the receivers I
have / have had, I think the
R-388 is still my favorite.

Pete

"Jim" wrote in message
...
Pete KE9OA Wrote:

Does anybody have a copy of the April 1977 QST?
The article I am interested in the the one by
Howard Sartori, entitled
"solid tubes, a new life for old designs".


Pete, the last time I did this, I had dual gate MosFET devices. These
days they are harder to find, so I'd probably use two JFETs in cascade to
get more or less the same effect.

I vaguelly remember the article recommends dual gate MosFETs but I will
admit, it's been a long time since I read it.


Jim Pennell
N6BIU


--

21:55 Pacific Time Zone
Jan 14 2008

International Time
05:55 UTC
15.01.2008

Dual Gate MosFets are convenient for a tube replacement....

As I recall, I rectified the old filament voltage, regulated it, and made
that the new "plate" voltage. Other than that, JFETs and, when necessary,
Dual Gate MosFETs did most of the work.

Well, had to mess with the "grid" bias resistors too.

OK, so I used an audio Amp IC for the last part of the audio chain.
Still, all in all, the conversions I did were surprisingly easy.


Jim


--

22:34 Pacific Time Zone
Jan 15 2008

International Time
06:34 UTC
16.01.2008

"Pete KE9OA" wrote in message
...
Hi,

Does anybody have a copy of the April 1977 QST? The article I am
interested in the the one by Howard Sartori, entitled
"solid tubes, a new life for old designs".
If somebody could scan this article, I would be glad to pay them. Thanks!

Pete KE9OA


If anyone could send this article (or these jpegs) to my Hotmail address it
would be greatly appreciated. I too would like to update an old but beloved
boat-anchor.

Dave

Pete KE9OA wrote:
Hi,

Does anybody have a copy of the April 1977 QST? The article I am interested
in the the one by Howard Sartori, entitled
"solid tubes, a new life for old designs".
If somebody could scan this article, I would be glad to pay them. Thanks!

Pete KE9OA



Well, I too would be interested in viewing this article--if there is
anyone so kind:



Regards,
JS

Pete KE9OA wrote:

Hi,

Does anybody have a copy of the April 1977 QST? The article I am interested
in the the one by Howard Sartori, entitled
"solid tubes, a new life for old designs".
If somebody could scan this article, I would be glad to pay them. Thanks!

Pete KE9OA



I made a pdf from i3hev's scans and will gladly email it to anyone who asks.

Regards,

Michael

msg wrote:

Pete KE9OA wrote:

Hi,

Does anybody have a copy of the April 1977 QST? The article I am
interested in the the one by Howard Sartori, entitled
"solid tubes, a new life for old designs".
If somebody could scan this article, I would be glad to pay them. Thanks!

Pete KE9OA


I made a pdf from i3hev's scans and will gladly email it to anyone who
asks.


I tried emailing to mario, i3hev, but it bounced (user unknown) using the
'From' and 'Return-path' addresses from his email to me. Anyway, thanks
mario for the scans.

Michael

msg wrote:

I tried emailing to mario, i3hev, but it bounced... Anyway, thanks...

you're welcome

I'm a bit worried about the bounces, I only use valid addresses - oh,
well, mysteries of the network... :-o

Ciao!
--
73 es 51 de i3hev, op. mario

Non è Radioamatore, se non gli fuma il saldatore!
- Campagna 2006 "Il Radioamatore non è uno che ascolta la radio"

it.hobby.radioamatori.moderato
http://digilander.libero.it/hamweb
http://digilander.libero.it/esperantovenezia

msg wrote:
I made a pdf from i3hev's scans and will gladly email it to anyone who asks.

I'd love a copy. My e-mail address is good.

--
If John McCain gets the 2008 Republican Presidential nomination,
my vote for President will be a write-in for Jiang Zemin.