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Author Topic: HW-7 Finals  (Read 2556 times)
AA4MI
Member

Posts: 5




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« on: April 11, 2013, 05:31:06 PM »


Does anyone have an old HW-7 that I can cannibilize the finals from?

Or any more specific info on substitute finals I can purchase and solder in?

Thanks; I' really looking forward to getting this one I have operating.

73, Carl, AA4MI

My email is :   aa4mi@arrl.net

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W9GB
Member

Posts: 2626




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« Reply #1 on: April 11, 2013, 06:00:50 PM »

Heath-kit HW-7 house number: 417-224, and the schematic shows Motorola MPSU05
http://www.vintage-radio.info/heathkit/

RF PARTS lists this transistor as In Stock:
MPSU05       $2.95
http://www.rfparts.com/old_site/transistors_MISC.html

Earlier eHam.net Q&A
http://www.eham.net/ehamforum/smf/index.php?topic=55890.0;wap2

Antique Radio thread on same query.
http://www.antiqueradios.com/forums/viewtopic.php?f=19&t=218115

Can you find a 2N6551? This is in a TO-202 standard JEDEC case.
The pins are E-B-C and the tab is Collector. Should be a decent substitute.
http://www.datasheetcatalog.org/datasheet/central/2N6554.pdf

==
KK4KF's Heathkit HW-7/8/9 Information Page
http://www.qsl.net/kk4kf/heathkit.html

List of Modifications for the Heathkit HW-7
by Randy Hardengrader, WJ4P
http://www.qsl.net/kk4kf/hw7-mods.html
« Last Edit: April 11, 2013, 06:26:43 PM by W9GB » Logged
WB6BYU
Member

Posts: 13342




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« Reply #2 on: April 12, 2013, 03:12:49 PM »

Dan's Small Parts and Kits lists the MPS-U05 for $2 near the bottom of this page:
http://danscloseoutsandspecialdeals.com/specialdealsandleftovers.html

Otherwise just about any CB output transistor will probably work, especially
those in a TO-220 case.  (I've used the RCA 4013 in a TO-39 case in some
other QRP rigs with good results, but haven't tired it in my HW-8.)
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