Re: AFG/RFG controls R4C (W1ES)
Yep -- I got that.
Looks like there's one of the AF GAIN ones currently on eBay but no concentric one.
eBay is where you're going to find them, eventually...
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, January 6th, 2025 at 7:07 PM, Rob Sherwood via groups.io <rob@...> wrote:
It was Kurz Kasch who made the knobs for me. ?No longer available.?
Rob, NC0B?
On Jan 6, 2025, at 3:41?PM, Art Delibert via groups.io <radio75a3@...> wrote:
?
Some years ago, Sherwood Engineering listed the concentric RF/AF knobs in its catalog as an upgrade.? Rob Sherwood might be able to provide the name of the manufacturer and the part numbers for them.?
Art Delibert, KB3FJO
I'm not sure.? I bought the set at a hamfest and it had the knobs on it already.
I'm not one for making "mods" to vintage equipment but this one is really, really nice and is easily reversible.
Trying to find anything on the internet today is such a death march that I'm afraid that I'll leave it to you.? The type of knob used on 4-Line is called a "bar knob".? I'll try searching but I'm sure
I will get 10 pages of "Buy it here" rubbish...
My patience with the internet is thinner than rice paper at this point.? It has been ruined.
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, January 6th, 2025 at 12:57 PM, Joseph K7CBR via groups.io <k7cbr@...> wrote:
Hello Steve,
Is the control you used still available or is it obsolete? Thanks
Joseph
On Monday, January 6, 2025 at 12:51:03 PM EST, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
I just took a quick look inside my late (28xxx) R-4C and it looks like there are circuits and structures that would interfere with a shield extension but I can hear the modulation a lot more when the slug/rod is out the back.
My receiver is totally stock except for having changed out the original AFG/RFG controls for a nice concentric plastic knob set that looks just like what Drake ¡°should have¡± put there.
I will likely leave things as they are, as it¡¯s more of a collector piece that I play with. ?It¡¯s similar in the auto world as a stock vs modified ¡°thing¡±. ?I am also not short on things that I need to do.
73,?
W1ES
|
Re: Mn2000 broken insulator
Are they1/2 inch long? I may have some.
Gary?
toggle quoted message
Show quoted text
On Jan 6, 2025, at 6:15?PM, Paul N5NEN via groups.io <n5nen@...> wrote:
Broken standoffs (2) on front of capacitors. What can I find for replacement parts?<IMG_3076.jpeg>
|
Re: AFG/RFG controls R4C (W1ES)
Thanks, Rob.? I guess I was lucky to have found an R-4C that has them.? It looked like what that knob set SHOULD have looked like.? I've never been a fan of those pointy metal ones for RF gain.? The bandwidth pointer is longer and was perfect for that application.
I actually had two complete C Lines that I bought, I think, in 2022 and the first one had those knobs.? The receiver wasn't as nice as the second set, so I swapped. It just looks as if it belongs there!
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, January 6th, 2025 at 7:07 PM, Rob Sherwood via groups.io <rob@...> wrote:
It was Kurz Kasch who made the knobs for me. ?No longer available.?
Rob, NC0B?
On Jan 6, 2025, at 3:41?PM, Art Delibert via groups.io <radio75a3@...> wrote:
?
Some years ago, Sherwood Engineering listed the concentric RF/AF knobs in its catalog as an upgrade.? Rob Sherwood might be able to provide the name of the manufacturer and the part numbers for them.?
Art Delibert, KB3FJO
I'm not sure.? I bought the set at a hamfest and it had the knobs on it already.
I'm not one for making "mods" to vintage equipment but this one is really, really nice and is easily reversible.
Trying to find anything on the internet today is such a death march that I'm afraid that I'll leave it to you.? The type of knob used on 4-Line is called a "bar knob".? I'll try searching but I'm sure
I will get 10 pages of "Buy it here" rubbish...
My patience with the internet is thinner than rice paper at this point.? It has been ruined.
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, January 6th, 2025 at 12:57 PM, Joseph K7CBR via groups.io <k7cbr@...> wrote:
Hello Steve,
Is the control you used still available or is it obsolete? Thanks
Joseph
On Monday, January 6, 2025 at 12:51:03 PM EST, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
I just took a quick look inside my late (28xxx) R-4C and it looks like there are circuits and structures that would interfere with a shield extension but I can hear the modulation a lot more when the slug/rod is out the back.
My receiver is totally stock except for having changed out the original AFG/RFG controls for a nice concentric plastic knob set that looks just like what Drake ¡°should have¡± put there.
I will likely leave things as they are, as it¡¯s more of a collector piece that I play with. ?It¡¯s similar in the auto world as a stock vs modified ¡°thing¡±. ?I am also not short on things that I need to do.
73,?
W1ES
|
Re: R-4 AM detector 1N625
"which must have replaced it".? Sorry...
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, January 6th, 2025 at 7:47 PM, Steve Wedge, W1ES <w1es@...> wrote:
I thought so, too but when I looked up the part, it's a silicon diode and it's on the data sheet with the 1N914 series -- which it must have replaced.
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, January 6th, 2025 at 7:17 PM, Rob Sherwood via groups.io <rob@...> wrote:
Isn¡¯t it supposed to be a germanium diode? Rob, NC0B?
On Jan 6, 2025, at 11:06?AM, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
?
Hello, Jan. ?It appears that this could be replaced with the very common 1N914.?
73,
Steve Wedge, W1ES
Time flies like an arrow. Fruit flies like a banana.
On Mon, Jan 6, 2025 at 11:49 AM, Jan SM5MRQ < jan@...> wrote:
[Edited Message Follows]
Hi guys?
?
I am working on a R-4 receiver and am not satisfied with the AM mode , I suspect the AM- detector diods 1N625 as I had to replace the V10 / 12AX7A tube which is surrounded by 3 of these diods. What do you guys use as a substitute for the 1N625 diode?
?
73 Jan SM5MRQ
?
?
|
Re: R-4 AM detector 1N625
I thought so, too but when I looked up the part, it's a silicon diode and it's on the data sheet with the 1N914 series -- which it must have replaced.
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, January 6th, 2025 at 7:17 PM, Rob Sherwood via groups.io <rob@...> wrote:
Isn¡¯t it supposed to be a germanium diode? Rob, NC0B?
On Jan 6, 2025, at 11:06?AM, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
?
Hello, Jan. ?It appears that this could be replaced with the very common 1N914.?
73,
Steve Wedge, W1ES
Time flies like an arrow. Fruit flies like a banana.
On Mon, Jan 6, 2025 at 11:49 AM, Jan SM5MRQ < jan@...> wrote:
[Edited Message Follows]
Hi guys?
?
I am working on a R-4 receiver and am not satisfied with the AM mode , I suspect the AM- detector diods 1N625 as I had to replace the V10 / 12AX7A tube which is surrounded by 3 of these diods. What do you guys use as a substitute for the 1N625 diode?
?
73 Jan SM5MRQ
?
?
|
Re: AFG/RFG controls R4C (W1ES)
I wasn¡¯t clear. No longer available from Kurz Kasch. ?Rob, NC0B?
toggle quoted message
Show quoted text
On Jan 6, 2025, at 5:07?PM, Rob Sherwood via groups.io <rob@...> wrote:
? It was Kurz Kasch who made the knobs for me. ?No longer available.?
Rob, NC0B?
On Jan 6, 2025, at 3:41?PM, Art Delibert via groups.io <radio75a3@...> wrote:
?
Some years ago, Sherwood Engineering listed the concentric RF/AF knobs in its catalog as an upgrade.? Rob Sherwood might be able to provide the name of the manufacturer and the part numbers for them.?
Art Delibert, KB3FJO
I'm not sure.? I bought the set at a hamfest and it had the knobs on it already.
I'm not one for making "mods" to vintage equipment but this one is really, really nice and is easily reversible.
Trying to find anything on the internet today is such a death march that I'm afraid that I'll leave it to you.? The type of knob used on 4-Line is called a "bar knob".? I'll try searching but I'm sure
I will get 10 pages of "Buy it here" rubbish...
My patience with the internet is thinner than rice paper at this point.? It has been ruined.
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, January 6th, 2025 at 12:57 PM, Joseph K7CBR via groups.io <k7cbr@...> wrote:
Hello Steve,
Is the control you used still available or is it obsolete? Thanks
Joseph
On Monday, January 6, 2025 at 12:51:03 PM EST, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
I just took a quick look inside my late (28xxx) R-4C and it looks like there are circuits and structures that would interfere with a shield extension but I can hear the modulation a lot more when the slug/rod is out the back.
My receiver is totally stock except for having changed out the original AFG/RFG controls for a nice concentric plastic knob set that looks just like what Drake ¡°should have¡± put there.
I will likely leave things as they are, as it¡¯s more of a collector piece that I play with. ?It¡¯s similar in the auto world as a stock vs modified ¡°thing¡±. ?I am also not short on things that I need to do.
73,?
W1ES
|
Re: Mn2000 broken insulator
You might try eBay. ?Also, if you can find an equivalent size in nylon or Teflon, it might resist shock damage better.
Broken standoffs (2) on front of capacitors. What can I find for replacement parts? 
|
Re: Mn2000 broken insulator
Hi Paul,
You may be able to find what you need here?
73
Stan
KM4HQE
On 1/6/25 18:15, Paul N5NEN via
groups.io wrote:
toggle quoted message
Show quoted text
Broken standoffs (2) on front of capacitors. What can I find
for replacement parts? 
|
Re: R-4 AM detector 1N625
Isn¡¯t it supposed to be a germanium diode? Rob, NC0B?
toggle quoted message
Show quoted text
On Jan 6, 2025, at 11:06?AM, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
?
Hello, Jan. ?It appears that this could be replaced with the very common 1N914.?
73,
Steve Wedge, W1ES
Time flies like an arrow. Fruit flies like a banana.
On Mon, Jan 6, 2025 at 11:49 AM, Jan SM5MRQ < jan@...> wrote:
[Edited Message Follows]
Hi guys?
?
I am working on a R-4 receiver and am not satisfied with the AM mode , I suspect the AM- detector diods 1N625 as I had to replace the V10 / 12AX7A tube which is surrounded by 3 of these diods. What do you guys use as a substitute for the 1N625 diode?
?
73 Jan SM5MRQ
?
?
|
Broken standoffs (2) on front of capacitors. What can I find for replacement parts? 
|
Re: AFG/RFG controls R4C (W1ES)
It was Kurz Kasch who made the knobs for me. ?No longer available.?
Rob, NC0B?
toggle quoted message
Show quoted text
On Jan 6, 2025, at 3:41?PM, Art Delibert via groups.io <radio75a3@...> wrote:
?
Some years ago, Sherwood Engineering listed the concentric RF/AF knobs in its catalog as an upgrade.? Rob Sherwood might be able to provide the name of the manufacturer and the part numbers for them.?
Art Delibert, KB3FJO
I'm not sure.? I bought the set at a hamfest and it had the knobs on it already.
I'm not one for making "mods" to vintage equipment but this one is really, really nice and is easily reversible.
Trying to find anything on the internet today is such a death march that I'm afraid that I'll leave it to you.? The type of knob used on 4-Line is called a "bar knob".? I'll try searching but I'm sure
I will get 10 pages of "Buy it here" rubbish...
My patience with the internet is thinner than rice paper at this point.? It has been ruined.
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, January 6th, 2025 at 12:57 PM, Joseph K7CBR via groups.io <k7cbr@...> wrote:
Hello Steve,
Is the control you used still available or is it obsolete? Thanks
Joseph
On Monday, January 6, 2025 at 12:51:03 PM EST, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
I just took a quick look inside my late (28xxx) R-4C and it looks like there are circuits and structures that would interfere with a shield extension but I can hear the modulation a lot more when the slug/rod is out the back.
My receiver is totally stock except for having changed out the original AFG/RFG controls for a nice concentric plastic knob set that looks just like what Drake ¡°should have¡± put there.
I will likely leave things as they are, as it¡¯s more of a collector piece that I play with. ?It¡¯s similar in the auto world as a stock vs modified ¡°thing¡±. ?I am also not short on things that I need to do.
73,?
W1ES
|
Re: AFG/RFG controls R4C (W1ES)
I¡¯ll see if I can find it.
An internet search, as expected, turned up mostly things that weren¡¯t even knobs.
Steve Wedge, W1ES
Time flies like an arrow. Fruit flies like a banana.
On Mon, Jan 6, 2025 at 5:41 PM, Art Delibert via groups.io < radio75a3@...> wrote:
Some years ago, Sherwood Engineering listed the concentric RF/AF knobs in its catalog as an upgrade.? Rob Sherwood might be able to provide the name of the manufacturer and the part numbers for them.?
Art Delibert, KB3FJO
I'm not sure.? I bought the set at a hamfest and it had the knobs on it already.
I'm not one for making "mods" to vintage equipment but this one is really, really nice and is easily reversible.
Trying to find anything on the internet today is such a death march that I'm afraid that I'll leave it to you.? The type of knob used on 4-Line is called a "bar knob".? I'll try searching but I'm sure I will get 10 pages of "Buy it here" rubbish...
My patience with the internet is thinner than rice paper at this point.? It has been ruined.
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with
secure email.
On Monday, January 6th, 2025 at 12:57 PM, Joseph K7CBR via groups.io <k7cbr@...> wrote:
Hello Steve,
Is the control you used still available or is it obsolete? Thanks
Joseph
On Monday, January 6, 2025 at 12:51:03 PM EST, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
I just took a quick look inside my late (28xxx) R-4C and it looks like there are circuits and structures that would interfere with a shield extension but I can hear the modulation a lot more when the slug/rod is out the back.
My receiver is totally stock except for having changed out the original AFG/RFG controls for a nice concentric plastic knob set that looks just like what Drake ¡°should have¡± put there.
I will likely leave things as they are, as it¡¯s more of a collector piece that I play with. ?It¡¯s similar in the auto world as a stock vs modified ¡°thing¡±. ?I am also not short on things that I need to do.
73,?
W1ES
|
Re: AFG/RFG controls R4C (W1ES)
Some years ago, Sherwood Engineering listed the concentric RF/AF knobs in its catalog as an upgrade.? Rob Sherwood might be able to provide the name of the manufacturer and the part numbers for them.?
Art Delibert, KB3FJO
toggle quoted message
Show quoted text
I'm not sure.? I bought the set at a hamfest and it had the knobs on it already.
I'm not one for making "mods" to vintage equipment but this one is really, really nice and is easily reversible.
Trying to find anything on the internet today is such a death march that I'm afraid that I'll leave it to you.? The type of knob used on 4-Line is called a "bar knob".? I'll try searching but I'm sure
I will get 10 pages of "Buy it here" rubbish...
My patience with the internet is thinner than rice paper at this point.? It has been ruined.
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, January 6th, 2025 at 12:57 PM, Joseph K7CBR via groups.io <k7cbr@...> wrote:
Hello Steve,
Is the control you used still available or is it obsolete? Thanks
Joseph
On Monday, January 6, 2025 at 12:51:03 PM EST, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
I just took a quick look inside my late (28xxx) R-4C and it looks like there are circuits and structures that would interfere with a shield extension but I can hear the modulation a lot more when the slug/rod is out the back.
My receiver is totally stock except for having changed out the original AFG/RFG controls for a nice concentric plastic knob set that looks just like what Drake ¡°should have¡± put there.
I will likely leave things as they are, as it¡¯s more of a collector piece that I play with. ?It¡¯s similar in the auto world as a stock vs modified ¡°thing¡±. ?I am also not short on things that I need to do.
73,?
W1ES
|
Re: Using the PLJ-6LED digital display with the R4C
Floyd, cannot recall on mine, dont think I used any capacitor for injection for my C line.
? ? ?Frank Krozel ? ? ? ? ? ?KG9H Life Member, ARRL ? ? (630) 924-1600 kg9hfrank@...
|
Re: Using the PLJ-6LED digital display with the R4C
Thanks, Frank.? Most of that I already had, but the charts showing the sensitivity by frequency was interesting.? Looks like there could be a loss of sensitivity as much as 10 dB between 160 and 10 meters.? I don't know if these units all come from a single manufacturer or if there are differences between different manufacturers.? Unless the counter is loading down the signal coming from the INJ jack, the stated sensitivity is far better than what I'm seeing.
?
73, Floyd - K8AC
|
Re: Using the PLJ-6LED digital display with the R4C
I just sent you manuals.
? ? ?Frank Krozel ? ? ? ? ? ?KG9H Life Member, ARRL ? ? (630) 924-1600 kg9hfrank@...
|
Re: Using the PLJ-6LED digital display with the R4C
Just scoped the voltage at the INJ jack on the R4C across the bands.? As suspected, the voltage drops off the higher you go.? Here's what I see:
?
1.8 MHz - 1.96 VP-P
3.5 MHz - 2.08 VP-P
7.0 MHz - 5.9 VP-P
10 MHz - 3.96 VP-P
14 MHz - 1.82 VP-P
21 MH - 1.3 VP-P
28 MHz - 1.76 VP-P
?
It seems that anything below 1.9 V or so is where the problem starts.? These voltages were measured at the INJ jack without the counter connected and going straight into the scope with no probe attenuation.
?
73, Floyd - K8AC
|
Using the PLJ-6LED digital display with the R4C
I've been experimenting with the PLJ-6LED LED display with the R4C for a couple of days and have some issues.? Would like to hear what others have done to perhaps resolve these problems.? I'm feeding the signal at the INJ jack on the R4C directly into the counter and the voltage to the unit is 13.8 V.? ?On frequencies from 1.8 to 10 MHz, the display is stable and the frequency is accurate (checked against 10 MHz WWV).? On 14 MHz,? the frequency display becomes unstable, jumping around within a KHz or so of the correct frequency.? On 21, 24 and 28 MHz, the display is extremely unstable and the frequency shown is randomly up to several MHz off.? The R4C is properly aligned and I have full T4XC output on all bands when using the R4C to control the frequency.? I'm assuming that the signal level at the INJ jack for the higher frequencies is just not high enough for the unit to get an accurate sample, but haven't scoped it yet.
?
I've played with the sensitivity/bias pot on the display board but was unable to improve things.? Even on the lower bands where the signal must be adequate for the counter,? adjusting the sensitivity/bias control does not seem to provide a linear control, but rather shows a sweet spot above and below which stability is lost.? So, I wonder what others have experienced with the counter on the higher bands?? If you don't see the same issue I'm seeing, did you use a buffer stage to feed the counter as the fellow who made the Youtube videos on the subject did?? I have two of the counters and they both behave the same way.??
?
Any suggestions appreciated.
?
73, Floyd - K8AC
|
Re: AFG/RFG controls R4C (W1ES)
I'm not sure.? I bought the set at a hamfest and it had the knobs on it already.
I'm not one for making "mods" to vintage equipment but this one is really, really nice and is easily reversible.
Trying to find anything on the internet today is such a death march that I'm afraid that I'll leave it to you.? The type of knob used on 4-Line is called a "bar knob".? I'll try searching but I'm sure I will get 10 pages of "Buy it here" rubbish...
My patience with the internet is thinner than rice paper at this point.? It has been ruined.
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, January 6th, 2025 at 12:57 PM, Joseph K7CBR via groups.io <k7cbr@...> wrote:
Hello Steve,
Is the control you used still available or is it obsolete? Thanks
Joseph
On Monday, January 6, 2025 at 12:51:03 PM EST, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
I just took a quick look inside my late (28xxx) R-4C and it looks like there are circuits and structures that would interfere with a shield extension but I can hear the modulation a lot more when the slug/rod is out the back.
My receiver is totally stock except for having changed out the original AFG/RFG controls for a nice concentric plastic knob set that looks just like what Drake ¡°should have¡± put there.
I will likely leave things as they are, as it¡¯s more of a collector piece that I play with. ?It¡¯s similar in the auto world as a stock vs modified ¡°thing¡±. ?I am also not short on things that I need to do.
73,?
W1ES
|
Re: R4C Sherwood audio mod questions
Rob, please ignore my previous email. The attachments showed up on my laptop but not my cell phone. Bill N0CU
Steve,
I don¡¯t know, but removing most of the magnetic field is a better solution.? Paul¡¯s shield of the transformer didn¡¯t work.
Rob, NC0B?
?
I¡¯m wondering if the buzz could be tamed by extending the shield can of the PTO ¡ª slide a second metal box over the end where the slug rod comes out.?
Just spitballing¡¯¡
Steve Wedge, W1ES
Time flies like an arrow. Fruit flies like a banana.
On Sun, Jan 5, 2025 at 18:47, VE7PS via < ve7ps@...> wrote:
Floyd:
I recall looking at Rob's xformer shuffle mod a few years back and couldn't figure out why I would want to go through that, despite?having chassis punches of all sizes and having done many power supply board upgrades on many R-4C's which requires removing
most of the xformer leads.? Just didn't think it was worth it.
I'm not home much in winter and just happened to be home today and had the chance to check out Rob's (or was it Paul's?) suggestion?of listening?to the xtal calibrator at both ends of the 500 Khz dial.? WOW!? He was spot on! I had never tried this before.?
At 500 Khz on the dial, indeed the signal?is buzzy.
Now before I started unsoldering the transformer in the three R-4C's currently here, I stopped to think a bit.? How often do I use the upper portion of the 500 Khz dial?? The answer for me is not often at all.? In fact, I'm not?often above 250 Khz on the
dial, in part due to our Canadian frequency rules.? On top of that....CW is generally at the low end of the bands where I cannot audibly detect any of the AC buzz/hum I hear on the xtal calibrator signal at 500 Khz.? I have yet to check that with a scope.
There is no question it's there at the upper end.....do not even need the scope to tell me....but I rarely use that end of the bands.
YMMV!? For now that project remains a low priority.
73
Peter
VE7PS
On Sun, Jan 5, 2025 at 1:10?PM Floyd - K8AC via
<floydsense=
[email protected]> wrote:
Guess I'll look around for a chassis punch and add this to my project list.? I operate a lot of CW and really like to hear a very pure note.? I've been spoiled by the sound of CW from my RME 6900 the past few months.? RME used a balanced feed to the filaments,
no chassis ground on the filament string.? And, they applied +80 VDC to the filament circuit.? I was puzzled by that until I went to my old RCA tube manual and read about filament recommendations.? It was described there and advised that it was a way of reducing
hum.
?
73, Floyd - K8AC
|
Rob Sherwood
Floyd - K8AC