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Re: HT-45 tuning

Brian
 

Thank you very much for the reply. I will look at the switch. They are old. The original power supply for the HT-45 did not come with the AMP. The power supply that came with the amp has been converted to not use tubes. DC voltage is not present with the "filament" switch turned off but does show 2600 when the "filament" switch is turned on.
The amp does put out 500 watts with 45w from the exciter. I just do not want to damage the 400Z tube.
?
Thank you always.
W6BPT
Re: HT-45 tuning

 

Brian <1codetech@...> wrote
I have a question. I just noticed that when I switch on the "fil" switch the "plate" and "filiments" lights both come on. If I switch the plate to "on" the light still stays on. Is this normal? If not what could be the issue?
Hi, Brian

Does the HV power supply still use 866A or 3B28 rectifier tubes?
If a previous owner had changed to solid state rectifiers,
he would not need the heaters on, but plate voltage off preliminary
warm-up for the rectifier tubes before plate voltage is applied.
Hallicrafters says a 4 minute warm up is needed, Collins in the KWS-1
only used a 30 second warm up. You can ruin the rectifier tubes
if HV is applied immediately, because the mercury within the tube
needs preheating.

Is the DC Voltage still indicated on the HT-45 panel meter when the HV switch is off? If so, that's a problem. The "plate" indicator is a neon
lamp, so even a very high resistance path across the plate switch
contacts would be enough for it to light, without necessarily
passing enough current to turn on the relay in the HV supply.

Does the neon light in the HV power supply stay on when the HV switch is switched off? It should take a few minutes for it to go off completely,
as the bleeder resistors in the HV supply drain the capacitor.

The most likely failure is a that the plate switch of the HT-45 is stuck "on". That switch connects to the relay coil in the power supply,
which applies AC to the primary of the HV transformer.

I don't own an HT-45, I'm just going by the manual downloaded from BAMA.

73,
Ed Knobloch K4PF
Re: HT-45 tuning

Brian
 

Thanks,
?
I have a question. I just noticed that when I switch on the "fil" switch the "plate" and "filiments" lights both come on. If I switch the plate to "on" the light still stays on. Is this normal? If not what could be the issue?
?
Thank you very much.
?
73's and Semper Fi
?
Brian (W6BPT)
Re: CW Sidetone ideas

 

Great.
Please email me info?
73
Steve
Re: HT-45 tuning

 

Hi Brian,
?
Congratulations on your "new" amp!
?
I have one of those!? Just tune it using a watt meter for max output!? Drive it with no more than 40-50W so as not to exceed max grid current.?
?
You can peak "ballpark" plate and load settings by driving with very low power (5-10w) to get the approx settings, and then finish at (briefly) full output?
?
Keep tuning sessions as short as possible when approaching high grid currents "single-tone" .?
?
Expect to see color in the tube.? It's quite normal!
?
I get around 500-600w out of mine with around 2700V on the plate.
?
What are you driving it with?
?
?
?
?
--
73/Rick
W7IMM
__________________________________
All posts are created using free and opensource? Linux
Re: CW Sidetone ideas

 

On Fri, Dec 6, 2024 at 01:08 PM, John K5MO wrote:
I use the several Curtis keyers that are boatanchor proof, and can be set for paddles or manual keying.
?


?
Found on Ebay
?
John K5MO



On Fri, Dec 6, 2024 at 11:57?AM Steve Marquie via <=gmail.com@groups.io> wrote:
Good day all
I enjoy using various vintage "separates" on CW, with a bug.
The common issue is what to do for sidetone when using a straight key or bug. Typically,? not music the Rx, and have a fast hand on the RF gain control works well.
But, Collins and Drake have a sidetone.?
Has anyone added a sidetone to HT44/ SX117 or HT32B/SX101 SX115 combos?
73
W8tow
?

?

Steve--I have a? T O. Keyer I'll send you for $20 plus shipping.? ?It works fine
Re: HT-45 tuning

 

Welcome to the group.
?
I am not familiar with the Loudenboomer but, the settings of the amp would have to be determined experimentally since it is not or does not have a tuner or auto-tuner.? The quick reference would have to be made by you as you run low power and adjust the plate and load controls for peak output.? Then you can start an excel of word document to save the settings.? I have attached my setting document for my Ameritron amp to this posting as an example.
?
Good luck with it.

K2WH

AL-800 Tune Settings for Voice Frequencies.docx
AL-800 Tune Settings for Voice Frequencies.docx
AL-800H Tune Settings for Digital.docx
AL-800H Tune Settings for Digital.docx

New Member

Brian
 

Hello all,
?
I am a new member to the group but have been a HAM for awhile now. My main station now is a tentec omni VI with a HT45 amp. My callsign is W6BPT.?
I am looking forward to talking with everyone and I hope to chat with you on 15,20, or 40 meters someday.
?
73's and Semper Fi
?
Brian
HT-45 tuning

Brian
 

Hello all.
?
I am excited to have found this group. My callsign is W6BPT. I recently acquired a hallicrafters ht-45 loudenboomer. I did the initial tuning via the downloadable manual and the amp works great. My question to the forum is this:
Is there a writeup only on the tuning of the amp.?
I was hoping for something like this so when I go from 40 meters to 20 to 15 it would be a quick reference for quick tuning.
?
Thank you and 73's
?
Brian
Re: CW Sidetone ideas

 

When using a straight key, I do ok by listening to the sound of the key,
but I can't do that with a bug. Back in the '50s I had a 100TH with 866
rectifiers. The humming of the transformer laminations when I pressed
the key was all I needed.

73,

Maynard
W6PAP


On 12/9/24 19:07, Richard Knoppow via groups.io wrote:
A note: some old CW practice oscillators were set up to be keyed by
a sample of RF from the transmitter to provide a side tone. For instance
the Bud Radio oscillators. Should not be difficult to do this with a
solid state oscillator although I don't have a circuit. A simple pick up
loop will trigger the oscillator. I have not tried my Bud oscillator but
it can probably feed the receiver speaker of phones with a simple
parallel connection.
I used to mostly listen to my own signal via the station receiver
but that doesn't work if you are using two separate frequencies.

On 12/9/2024 4:51 PM, waltcates via groups.io wrote:

*Floyd,*
*
*
*When you get all the kinks out of?the side-tone mod, post a schematic
of your project.*
*

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
Re: CW Sidetone ideas

 

A note: some old CW practice oscillators were set up to be keyed by
a sample of RF from the transmitter to provide a side tone. For instance
the Bud Radio oscillators. Should not be difficult to do this with a
solid state oscillator although I don't have a circuit. A simple pick up
loop will trigger the oscillator. I have not tried my Bud oscillator but
it can probably feed the receiver speaker of phones with a simple
parallel connection.
I used to mostly listen to my own signal via the station receiver
but that doesn't work if you are using two separate frequencies.


On 12/9/2024 4:51 PM, waltcates via groups.io wrote:
*Floyd,*
*
*
*When you get all the kinks out of?the side-tone mod, post a schematic
of your project.*
*
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
Re: CW Sidetone ideas

 

开云体育

Floyd,

When you get all the kinks out of?the side-tone mod, post a schematic of your project.


Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.


From: HallicraftersRadios@groups.io <HallicraftersRadios@groups.io> on behalf of Floyd - K8AC via groups.io <floydsense@...>
Sent: Monday, December 9, 2024 6:49 PM
To: HallicraftersRadios@groups.io <HallicraftersRadios@groups.io>
Subject: Re: [HallicraftersRadios] CW Sidetone ideas
?
On Fri, Dec 6, 2024 at 03:33 PM, Don VE3IDS wrote:
It was powerful enough to just parallel across the speaker lines and drive the speaker directly.?
I've just started to work on a CW sidetone technique for the HT-44.? Great idea of Walt's to use a diode and pin 8 of the octal plug to accomplish the keying.? I built a little LM555 based sidetone oscillator based on the design at AA8V's website.? I found that I could connect the output to the 500 Ohm terminal on the rear of the SX-117 and that enables you to hear the sidetone in the headphones or the speaker.? Haven't worked out any volume differences yet.
?
73, Floyd - K8AC
Re: CW Sidetone ideas

 

On Fri, Dec 6, 2024 at 03:33 PM, Don VE3IDS wrote:
It was powerful enough to just parallel across the speaker lines and drive the speaker directly.?
I've just started to work on a CW sidetone technique for the HT-44.? Great idea of Walt's to use a diode and pin 8 of the octal plug to accomplish the keying.? I built a little LM555 based sidetone oscillator based on the design at AA8V's website.? I found that I could connect the output to the 500 Ohm terminal on the rear of the SX-117 and that enables you to hear the sidetone in the headphones or the speaker.? Haven't worked out any volume differences yet.
?
73, Floyd - K8AC
Re: HT-44 Common Problem?

 

开云体育

Floyd,

I have seen that a couple of times over the years. It boils down to the balance of all triodes in V3 and V4.? The triodes in each tube need to be matched and V3 and V4 need to be matched. If either of the tubes suffers an intermittent short, large loss of gain or becomes gassy you can lose R16 and 17.?

(You probably already know this, but I thump the tubes in the tube tester while doing the shorts test to check for intermittent shorts.)

If you find it difficult to balance the system, look for drifted resistors or leaky capacitors. The respective components in the V3 circuit need to be very close to equal to those in the V4 circuit.

?


Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.


From: HallicraftersRadios@groups.io <HallicraftersRadios@groups.io> on behalf of Floyd - K8AC via groups.io <floydsense@...>
Sent: Monday, December 9, 2024 9:32 AM
To: HallicraftersRadios@groups.io <HallicraftersRadios@groups.io>
Subject: [HallicraftersRadios] HT-44 Common Problem?
?
This is the second HT-44 where I've run into this problem.? I use the HT-44 heavily on CW and my current one has logged hundreds of QSOs in contests.? The other day it suddenly had no output on any band, same symptom observed on another HT-44 I owned.? In digging into the problem, I found the cause to be the same as on the other HT-44.? Resistors R16 and R17 (22K , 2 watt) were cooked and V3, a 12BH7 associated with those resistors tested weak.? I replaced the resistors and the 12BH7 and now all is well again.? Had to adjust the pots to null the carrier for SSB.? I wonder if others have experienced that problem?? Not sure if the cause of the failure was the tube, or maybe the two resistors are undersized for the current?
?
73, Floyd - K8AC
Re: HT-44 Common Problem?

 
Edited

I had to replace those resistors in a HT44 also. I recall measuring the current and it was exceeding the dissipation of the 2 watt resistors.

Unable to get my hands on 5 watt resistors, I put 10 watt 25k resistors in there.






On Mon, Dec 9, 2024, 9:32 AM Floyd - K8AC via <floydsense=gmail.com@groups.io> wrote:
This is the second HT-44 where I've run into this problem.? I use the HT-44 heavily on CW and my current one has logged hundreds of QSOs in contests.? The other day it suddenly had no output on any band, same symptom observed on another HT-44 I owned.? In digging into the problem, I found the cause to be the same as on the other HT-44.? Resistors R16 and R17 (22K , 2 watt) were cooked and V3, a 12BH7 associated with those resistors tested weak.? I replaced the resistors and the 12BH7 and now all is well again.? Had to adjust the pots to null the carrier for SSB.? I wonder if others have experienced that problem?? Not sure if the cause of the failure was the tube, or maybe the two resistors are undersized for the current?
?
73, Floyd - K8AC
HT-44 Common Problem?

 

This is the second HT-44 where I've run into this problem.? I use the HT-44 heavily on CW and my current one has logged hundreds of QSOs in contests.? The other day it suddenly had no output on any band, same symptom observed on another HT-44 I owned.? In digging into the problem, I found the cause to be the same as on the other HT-44.? Resistors R16 and R17 (22K , 2 watt) were cooked and V3, a 12BH7 associated with those resistors tested weak.? I replaced the resistors and the 12BH7 and now all is well again.? Had to adjust the pots to null the carrier for SSB.? I wonder if others have experienced that problem?? Not sure if the cause of the failure was the tube, or maybe the two resistors are undersized for the current?
?
73, Floyd - K8AC
Re: CW Sidetone ideas

 
Edited

I used one of these in a SR 150


It was powerful enough to just parallel across the speaker lines and drive the speaker directly.?

73 Don ve3ids?

On Fri., Dec. 6, 2024, 1:53 p.m. Steve Marquie via , <=gmail.com@groups.io> wrote:

?

Great suggestions. I have a external sidetone oscillator, and will give the “Pin #8” option a try. Once, I used a TO Keyer that I’d modified to accept a straight key input as an sidetone. Unfortunately, I don’t have that any longer.

?

73

Steve

?

?

?

ClimaTEQ, LLC

?

Steve Marquie, President

W8tow.sm@...

517-927-9322

YouTUBE

?

ClimaTEQ, LLC is a Campbell Scientific Partner

Project Management Institute PMI

Member AASC

?

From: HallicraftersRadios@groups.io <HallicraftersRadios@groups.io> On Behalf Of John K5MO via
Sent: Friday, December 6, 2024 1:09 PM
To: HallicraftersRadios@groups.io
Subject: Re: [HallicraftersRadios] CW Sidetone ideas

?

I use the several Curtis keyers that are boatanchor proof, and can be set for paddles or manual keying.

?

?

Found on Ebay

?

John K5MO

?

On Fri, Dec 6, 2024 at 11:57?AM Steve Marquie via <=gmail.com@groups.io> wrote:

Good day all

I enjoy using various vintage "separates" on CW, with a bug.

The common issue is what to do for sidetone when using a straight key or bug. Typically,? not music the Rx, and have a fast hand on the RF gain control works well.

But, Collins and Drake have a sidetone.?

Has anyone added a sidetone to HT44/ SX117 or HT32B/SX101 SX115 combos?

73

W8tow

?


Virus-free.
Re: CW Sidetone ideas

 
Edited

开云体育

?

Great suggestions. I have a external sidetone oscillator, and will give the “Pin #8” option a try. Once, I used a TO Keyer that I’d modified to accept a straight key input as an sidetone. Unfortunately, I don’t have that any longer.

?

73

Steve

?

?

?

ClimaTEQ, LLC

4565 Hawthorne Lane

Okemos, MI 48864

?

Steve Marquie, President

W8tow.sm@...

517-927-9322

YouTUBE

?

ClimaTEQ, LLC is a Campbell Scientific Partner

Project Management Institute PMI

Member AASC

?

From: HallicraftersRadios@groups.io <HallicraftersRadios@groups.io> On Behalf Of John K5MO via groups.io
Sent: Friday, December 6, 2024 1:09 PM
To: HallicraftersRadios@groups.io
Subject: Re: [HallicraftersRadios] CW Sidetone ideas

?

I use the several Curtis keyers that are boatanchor proof, and can be set for paddles or manual keying.

?

?

Found on Ebay

?

John K5MO

?

On Fri, Dec 6, 2024 at 11:57?AM Steve Marquie via <=gmail.com@groups.io> wrote:

Good day all

I enjoy using various vintage "separates" on CW, with a bug.

The common issue is what to do for sidetone when using a straight key or bug. Typically,? not music the Rx, and have a fast hand on the RF gain control works well.

But, Collins and Drake have a sidetone.?

Has anyone added a sidetone to HT44/ SX117 or HT32B/SX101 SX115 combos?

73

W8tow

?


Virus-free.
Re: CW Sidetone ideas

 
Edited

I use the several Curtis keyers that are boatanchor proof, and can be set for paddles or manual keying.




Found on Ebay

John K5MO



On Fri, Dec 6, 2024 at 11:57?AM Steve Marquie via <=gmail.com@groups.io> wrote:
Good day all
I enjoy using various vintage "separates" on CW, with a bug.
The common issue is what to do for sidetone when using a straight key or bug. Typically,? not music the Rx, and have a fast hand on the RF gain control works well.
But, Collins and Drake have a sidetone.?
Has anyone added a sidetone to HT44/ SX117 or HT32B/SX101 SX115 combos?
73
W8tow
?
Re: CW Sidetone ideas

 
Edited

开云体育

The simplest way is to connect an external tone oscillator to pin 8 of J3 Through a diode.



Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.


From: HallicraftersRadios@groups.io <HallicraftersRadios@groups.io> on behalf of Steve Marquie via groups.io <w8tow.sm@...>
Sent: Friday, December 6, 2024 11:57 AM
To: HallicraftersRadios@groups.io <HallicraftersRadios@groups.io>
Subject: [HallicraftersRadios] CW Sidetone ideas
?
Good day all
I enjoy using various vintage "separates" on CW, with a bug.
The common issue is what to do for sidetone when using a straight key or bug. Typically,? not music the Rx, and have a fast hand on the RF gain control works well.
But, Collins and Drake have a sidetone.?
Has anyone added a sidetone to HT44/ SX117 or HT32B/SX101 SX115 combos?
73
W8tow
?
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