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Just finished the AC4 Harbach power supply update and wanted to pass on my comments.
The kit arrived in a small box and included two assembled boards and a small bag of parts and hardware. The assembly went great with instructions available at the Harbach site. The instructions are basically Heathkit style and if you can follow directions, can solder, and have the rudimentary tools needed then you are good to go. I did most of the assembly in one night, but had to wait for the power cord gland I had ordered. The gland method of power cord restraint works very well. The only problem was the cover lip at that location was too long because the new gland was larger than the original wire strain relief. I just broke off the lip, which meant that the screw position could not be used. The bottom cover has many screws, and one missing is no big deal. I have not updated any other Drake supplies or used other products so I can only speak for this design and if I had it to do over again, I would not hesitate using this one.
es4ac-4ac $74.95
https://harbachelectronics.com/shop/drake/es4ac-4-ac-4-power-supply-rebuild-kit/
Photos show original supply and updated supply shots, as well as parts removed.
Doug, WA3DSP
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Doug,
Thanks for posting. I just ordered my kit and will give it a go. Can you repost the gland, so I can order one similar to yours?
My PS-4 is working just fine, but given its age, I think I want to tackle it now rather than wait for a catastrophic failure.
Gregg
KD1MU
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Gregg,
? Look through these messages and you will see the Mouser part, but also check out the other cheaper part mentioned further down. I ordered the Mouser part before I saw the later message. The Mouser part works with standard computer style 3 wire cables, but not the extra heavy ones. They are a dime a dozen. I just cut off the end that goes to the device and use the pug and cable.
/g/DRAKE-RADIO/topic/ac_4_three_wire_power_cord/97321404
Doug, WA3DSP
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Mc Master Carr is also an excellent source of cord grips.? Lots
of choices
Paul K0UYA
On 3/9/2023 3:31 PM, Doug Crompton
WA3DSP wrote:
toggle quoted message
Show quoted text
Gregg,
? Look through these messages and you will see the Mouser part,
but also check out the other cheaper part mentioned further down.
I ordered the Mouser part before I saw the later message. The
Mouser part works with standard computer style 3 wire cables, but
not the extra heavy ones. They are a dime a dozen. I just cut off
the end that goes to the device and use the pug and cable.
/g/DRAKE-RADIO/topic/ac_4_three_wire_power_cord/97321404
Doug, WA3DSP
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I'll second Doug's experience.
I used the same kit on a rebuild I did about 6 months ago.?
Modification / modernization came out fine as did Doug's.?
Instructions were clear.?
73/jeff/ac0c
alpha-charlie-zero-charlie
On 3/9/2023 2:14 AM, Doug Crompton
WA3DSP wrote:
toggle quoted message
Show quoted text
Just finished the AC4 Harbach power supply update and wanted to
pass on my comments.
The kit arrived in a small box and included two assembled boards
and a small bag of parts and hardware. The assembly went great
with instructions available at the Harbach site. The instructions
are basically Heathkit style and if you can follow directions, can
solder, and have the rudimentary tools needed then you are good to
go. I did most of the assembly in one night, but had to wait for
the power cord gland I had ordered. The gland method of power cord
restraint works very well. The only problem was the cover lip at
that location was too long because the new gland was larger than
the original wire strain relief. I just broke off the lip, which
meant that the screw position could not be used. The bottom cover
has many screws, and one missing is no big deal. I have not
updated any other Drake supplies or used other products so I can
only speak for this design and if I had it to do over again, I
would not hesitate using this one.
es4ac-4ac $74.95
Photos show original supply and updated supply shots, as well as
parts removed.
Doug, WA3DSP
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Doug, How long did it take for you to receive the kit after placing the order?
On Thu, Mar 9, 2023 at 1:16?AM Doug Crompton WA3DSP < wa3dsp@...> wrote: Just finished the AC4 Harbach power supply update and wanted to pass on my comments.
The kit arrived in a small box and included two assembled boards and a small bag of parts and hardware. The assembly went great with instructions available at the Harbach site. The instructions are basically Heathkit style and if you can follow directions, can solder, and have the rudimentary tools needed then you are good to go. I did most of the assembly in one night, but had to wait for the power cord gland I had ordered. The gland method of power cord restraint works very well. The only problem was the cover lip at that location was too long because the new gland was larger than the original wire strain relief. I just broke off the lip, which meant that the screw position could not be used. The bottom cover has many screws, and one missing is no big deal. I have not updated any other Drake supplies or used other products so I can only speak for this design and if I had it to do over again, I would not hesitate using this one.
es4ac-4ac $74.95
Photos show original supply and updated supply shots, as well as parts removed.
Doug, WA3DSP
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t took about 5¨C7 days as I remember. I usually always specify the cheapest shipping method unless I am in a hurry. In this case, it was first class mail. I am near Philadelphia.
?
Doug, WA3DSP
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That's nice.? I am debating now to restore my HP-23B for my HW-101.? I imagine that PS can power these old gals too.
-Chris KQ6UP
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Chris, before getting into tha project too deeply,?check what the plate voltage is for the Heathkit supply. I¡¯m not familiar with the specific numbers but many of the heathkits have 6146 finals, which use higher voltages than the Drake sweep tube finals.?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Oct 5, 2023 at 00:35, Christopher KQ6UP < christopher.maness@...> wrote: That's nice.? I am debating now to restore my HP-23B for my HW-101.? I imagine that PS can power these old gals too.
-Chris KQ6UP
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The plate voltage in that era Heath is somewhere on the order of 800V if I remember correctly, so you're right Steve
John K5MO
On Thu, Oct 5, 2023 at 9:16?AM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Chris, before getting into tha project too deeply,?check what the plate voltage is for the Heathkit supply. I¡¯m not familiar with the specific numbers but many of the heathkits have 6146 finals, which use higher voltages than the Drake sweep tube finals.?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Oct 5, 2023 at 00:35, Christopher KQ6UP < christopher.maness@...> wrote: That's nice.? I am debating now to restore my HP-23B for my HW-101.? I imagine that PS can power these old gals too.
-Chris KQ6UP
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Also, there are kits available?for the Heathkit power supplies. David Assaf III W5XU, VP8RXU ?
On Thu, Oct 5, 2023 at 8:16?AM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Chris, before getting into tha project too deeply,?check what the plate voltage is for the Heathkit supply. I¡¯m not familiar with the specific numbers but many of the heathkits have 6146 finals, which use higher voltages than the Drake sweep tube finals.?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Oct 5, 2023 at 00:35, Christopher KQ6UP < christopher.maness@...> wrote: That's nice.? I am debating now to restore my HP-23B for my HW-101.? I imagine that PS can power these old gals too.
-Chris KQ6UP
|
I successfully adapted an HP-23 to power my Collins KWM-2. The "low" B+
had two taps - one way too high, the other too low. So I put in a linear
regulator. First a big long diode string to get the voltage into the ballpark,
then a simple series regulator with a high voltage transistor.
- Jerry, KF6VB
toggle quoted message
Show quoted text
On 2023-10-05 08:30, David wrote: Also, there are kits available for the Heathkit power supplies.
David Assaf III
W5XU, VP8RXU
On Thu, Oct 5, 2023 at 8:16?AM Steve Wedge, W1ES/4 via groups.io [3]
<w1es@...> wrote:
Chris, before getting into tha project too deeply, check what the
plate voltage is for the Heathkit supply. I¡¯m not familiar with
the specific numbers but many of the heathkits have 6146 finals,
which use higher voltages than the Drake sweep tube finals.
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail [1] for iOS
On Thu, Oct 5, 2023 at 00:35, Christopher KQ6UP
<christopher.maness@... [2]> wrote:
That's nice. I am debating now to restore my HP-23B for my
HW-101. I imagine that PS can power these old gals too.
-Chris KQ6UP Links:
------
[1]
[2]
[3]
[4] /g/DRAKE-RADIO/message/73627
[5] /mt/97491993/243852
[6] /g/DRAKE-RADIO/post
[7] /g/DRAKE-RADIO/editsub/243852
[8] /g/DRAKE-RADIO/leave/12260778/243852/767576506/xyzzy
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There are but the first thing to check are the voltages provided.? Heathkits were mostly 6146 finals, which have 800V nominal plate supplies.
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
------- Original Message -------
On Thursday, October 5th, 2023 at 11:30 AM, David <david.w5xu@...> wrote:
Also, there are kits available for the Heathkit power supplies. David Assaf III W5XU, VP8RXU
On Thu, Oct 5, 2023 at 8:16?AM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Chris, before getting into tha project too deeply, check what the plate voltage is for the Heathkit supply. I¡¯m not familiar with the specific numbers but many of the heathkits have 6146 finals, which use higher voltages than the Drake sweep tube finals.
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Oct 5, 2023 at 00:35, Christopher KQ6UP < christopher.maness@...> wrote: That's nice. I am debating now to restore my HP-23B for my HW-101. I imagine that PS can power these old gals too.
-Chris KQ6UP
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Doug Crompton WA3DSP
David