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Hi group!
Recently I acquired an R4B(my first B), have a C line and a TR4C, so not my first rodeo ;).
But this R4B is really teasing me a bit, the S-meter is "stuck" at S5 as soon as the unit is switched to "ON".
So I tried an S-meter calibration but to no avail, Q4 checked out just fine, just for sanity check I also tried to switch the 2 12BA6's(No change).
Also the the S-meter "Zero" has be to be cranked all the way to one endpoint to reach the S5 as minimum deflection.
Now what may be a lead is that no matter what position AVC is in(OFF/FAST/SLOW) it makes no difference the meter sticks to S5.
So any ideas, pointers, measurements, and I would be grateful, first time I dig into a R4B AVC issue.
Kinda starting to think a resistor has wandered off, but where to start...
Thank you all for a great group, I really enjoy to read all the wise comments and suggestions ect, it's a great group!
Best 73's de Michael - oz8abr
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Hi Michael
See this thread:
/g/DRAKE-RADIO/topic/r_4b_agc_issues_part_trois/103544827
--
best regards,
Glenn, OZ1HFT
|
Michael, what is the voltage at TP2? ?There are other resistors in the bridge circuit and I have seen them go out of tolerance.?
What is the resistance reading across the RF GAIN pot?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sun, Mar 3, 2024 at 07:09, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
See this thread:
/g/DRAKE-RADIO/topic/r_4b_agc_issues_part_trois/103544827
--
best regards,
Glenn, OZ1HFT
|
HI again!
Tak for linked Glenn, kunne godt minde lidt om mit problem :). Okay enough "Danglish" .. @Steve, Thanks for taking your time to reply! Detuned and with AVC ON, TP2 voltage is-1.26, right now, I did an adjustment cold, so seems to have dropped ever so slightly after proper warm up.
RF GAIN Pot measures ~12Ohms(seem to be some capacitance) with wires attached, so guess that is quite okay.
Thanks, Michael-oz8abr
On Sun, Mar 3, 2024 at 2:11?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Michael, what is the voltage at TP2?? There are other resistors in the bridge circuit and I have seen them go out of tolerance.?
What is the resistance reading across the RF GAIN pot?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sun, Mar 3, 2024 at 07:09, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
See this thread:
/g/DRAKE-RADIO/topic/r_4b_agc_issues_part_trois/103544827
--
best regards,
Glenn, OZ1HFT
|
Hi Michael
Found a S-meter zero mod - but please check if the problem is gassy tubes, drifted resistors or something else first:
Quote: "...
3. S-Meter Zero Range. Some R-4B's and early R-4C receivers.
..."
--
best regards,
Glenn, OZ1HFT
|
Resistance is the most important here.
We now need to measure the TP2 voltage from startup to a point long after warmup.? If this value drifts towards 0V then there is a chance that you have a gassy tube.
The important part here is if the voltage at TP2 with respect to time.
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Sunday, March 3rd, 2024 at 12:50 PM, Michael Jensen <kavigal@...> wrote:
HI again!
Tak for linked Glenn, kunne godt minde lidt om mit problem :). Okay enough "Danglish" .. @Steve, Thanks for taking your time to reply! Detuned and with AVC ON, TP2 voltage is-1.26, right now, I did an adjustment cold, so seems to have dropped ever so slightly after proper warm up.
RF GAIN Pot measures ~12Ohms(seem to be some capacitance) with wires attached, so guess that is quite okay.
Thanks, Michael-oz8abr
On Sun, Mar 3, 2024 at 2:11?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Michael, what is the voltage at TP2? There are other resistors in the bridge circuit and I have seen them go out of tolerance.
What is the resistance reading across the RF GAIN pot?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sun, Mar 3, 2024 at 07:09, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
See this thread:
/g/DRAKE-RADIO/topic/r_4b_agc_issues_part_trois/103544827
--
best regards,
Glenn, OZ1HFT
|
@Steve Tonight's numbers :).
Cold and detuned TP2=-1.335v
30 mins TP2=-1.267v
60 mins TP2=-1.259v
I get your point about "
The important part here is if the voltage at TP2 with respect to time."
Now what is the verdict? Too much voltage drop? What do you think?
Thanks, Michael.
On Sun, Mar 3, 2024 at 11:49?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Resistance is the most important here.
We now need to measure the TP2 voltage from startup to a point long after warmup.? If this value drifts towards 0V then there is a chance that you have a gassy tube.
The important part here is if the voltage at TP2 with respect to time.
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Sunday, March 3rd, 2024 at 12:50 PM, Michael Jensen < kavigal@...> wrote:
HI again!
Tak for linked Glenn, kunne godt minde lidt om mit problem :). Okay enough "Danglish" .. @Steve, Thanks for taking your time to reply! Detuned and with AVC ON, TP2 voltage is-1.26, right now, I did an adjustment cold, so seems to have dropped ever so slightly after proper warm up.
RF GAIN Pot measures ~12Ohms(seem to be some capacitance) with wires attached, so guess that is quite okay.
Thanks, Michael-oz8abr
On Sun, Mar 3, 2024 at 2:11?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Michael, what is the voltage at TP2? There are other resistors in the bridge circuit and I have seen them go out of tolerance.
What is the resistance reading across the RF GAIN pot?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sun, Mar 3, 2024 at 07:09, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
See this thread:
/g/DRAKE-RADIO/topic/r_4b_agc_issues_part_trois/103544827
--
best regards,
Glenn, OZ1HFT
|
Those figures don't indicate a problem.? Ideally, TP2, with the preselector detuned, should read -1.35V? Your reading isn't terrible.? So now we need to see why you're getting S5 with no signal.? On the schematic, R41 and R89, in the meter bridge circuit, should be checked.
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, March 4th, 2024 at 3:53 PM, Michael Jensen <kavigal@...> wrote:
@Steve Tonight's numbers :).
Cold and detuned TP2=-1.335v
30 mins TP2=-1.267v
60 mins TP2=-1.259v
I get your point about "
The important part here is if the voltage at TP2 with respect to time."
Now what is the verdict? Too much voltage drop? What do you think?
Thanks, Michael.
On Sun, Mar 3, 2024 at 11:49?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Resistance is the most important here.
We now need to measure the TP2 voltage from startup to a point long after warmup. If this value drifts towards 0V then there is a chance that you have a gassy tube.
The important part here is if the voltage at TP2 with respect to time.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent with secure email.
On Sunday, March 3rd, 2024 at 12:50 PM, Michael Jensen < kavigal@...> wrote:
HI again!
Tak for linked Glenn, kunne godt minde lidt om mit problem :). Okay enough "Danglish" .. @Steve, Thanks for taking your time to reply! Detuned and with AVC ON, TP2 voltage is-1.26, right now, I did an adjustment cold, so seems to have dropped ever so slightly after proper warm up.
RF GAIN Pot measures ~12Ohms(seem to be some capacitance) with wires attached, so guess that is quite okay.
Thanks, Michael-oz8abr
On Sun, Mar 3, 2024 at 2:11?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Michael, what is the voltage at TP2? There are other resistors in the bridge circuit and I have seen them go out of tolerance.
What is the resistance reading across the RF GAIN pot?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sun, Mar 3, 2024 at 07:09, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
See this thread:
/g/DRAKE-RADIO/topic/r_4b_agc_issues_part_trois/103544827
--
best regards,
Glenn, OZ1HFT
|
Okay they resistors measure as follows: Both liftet from PCB R41=837 OHMS R89=557 OHMS So not horrible out of tolerances I guess.
On Mon, Mar 4, 2024 at 11:43?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Those figures don't indicate a problem.? Ideally, TP2, with the preselector detuned, should read -1.35V? Your reading isn't terrible.? So now we need to see why you're getting S5 with no signal.? On the schematic, R41 and R89, in the meter bridge circuit, should be checked.
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, March 4th, 2024 at 3:53 PM, Michael Jensen < kavigal@...> wrote:
@Steve Tonight's numbers :).
Cold and detuned TP2=-1.335v
30 mins TP2=-1.267v
60 mins TP2=-1.259v
I get your point about "
The important part here is if the voltage at TP2 with respect to time."
Now what is the verdict? Too much voltage drop? What do you think?
Thanks, Michael.
On Sun, Mar 3, 2024 at 11:49?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Resistance is the most important here.
We now need to measure the TP2 voltage from startup to a point long after warmup. If this value drifts towards 0V then there is a chance that you have a gassy tube.
The important part here is if the voltage at TP2 with respect to time.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent with secure email.
On Sunday, March 3rd, 2024 at 12:50 PM, Michael Jensen < kavigal@...> wrote:
HI again!
Tak for linked Glenn, kunne godt minde lidt om mit problem :). Okay enough "Danglish" .. @Steve, Thanks for taking your time to reply! Detuned and with AVC ON, TP2 voltage is-1.26, right now, I did an adjustment cold, so seems to have dropped ever so slightly after proper warm up.
RF GAIN Pot measures ~12Ohms(seem to be some capacitance) with wires attached, so guess that is quite okay.
Thanks, Michael-oz8abr
On Sun, Mar 3, 2024 at 2:11?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Michael, what is the voltage at TP2? There are other resistors in the bridge circuit and I have seen them go out of tolerance.
What is the resistance reading across the RF GAIN pot?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sun, Mar 3, 2024 at 07:09, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
See this thread:
/g/DRAKE-RADIO/topic/r_4b_agc_issues_part_trois/103544827
--
best regards,
Glenn, OZ1HFT
|
Those are okay.
If you don¡¯t have extra tubes, try swapping around the 12BA6¡¯s and see if anything changes. ?Also look at the AGC circuit and make sure that the transistor (can¡¯t remember if it¡¯s Q4 or Q7 but it¡¯s the one that generates the AGC voltage) is a 2N3877 or equivalent.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Tue, Mar 5, 2024 at 5:01 AM, Michael Jensen < kavigal@...> wrote: Okay they resistors measure as follows: Both liftet from PCB R41=837 OHMS R89=557 OHMS So not horrible out of tolerances I guess.
On Mon, Mar 4, 2024 at 11:43?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Those figures don't indicate a problem. Ideally, TP2, with the preselector detuned, should read -1.35V Your reading isn't terrible. So now we need to see why you're getting S5 with no signal. On the schematic, R41 and R89, in the meter bridge circuit, should be checked.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent with secure email.
On Monday, March 4th, 2024 at 3:53 PM, Michael Jensen < kavigal@...> wrote:
@Steve Tonight's numbers :).
Cold and detuned TP2=-1.335v
30 mins TP2=-1.267v
60 mins TP2=-1.259v
I get your point about "
The important part here is if the voltage at TP2 with respect to time."
Now what is the verdict? Too much voltage drop? What do you think?
Thanks, Michael.
On Sun, Mar 3, 2024 at 11:49?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Resistance is the most important here.
We now need to measure the TP2 voltage from startup to a point long after warmup. If this value drifts towards 0V then there is a chance that you have a gassy tube.
The important part here is if the voltage at TP2 with respect to time.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent with secure email.
On Sunday, March 3rd, 2024 at 12:50 PM, Michael Jensen < kavigal@...> wrote:
HI again!
Tak for linked Glenn, kunne godt minde lidt om mit problem :). Okay enough "Danglish" .. @Steve, Thanks for taking your time to reply! Detuned and with AVC ON, TP2 voltage is-1.26, right now, I did an adjustment cold, so seems to have dropped ever so slightly after proper warm up.
RF GAIN Pot measures ~12Ohms(seem to be some capacitance) with wires attached, so guess that is quite okay.
Thanks, Michael-oz8abr
On Sun, Mar 3, 2024 at 2:11?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Michael, what is the voltage at TP2? There are other resistors in the bridge circuit and I have seen them go out of tolerance.
What is the resistance reading across the RF GAIN pot?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sun, Mar 3, 2024 at 07:09, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
See this thread:
/g/DRAKE-RADIO/topic/r_4b_agc_issues_part_trois/103544827
--
best regards,
Glenn, OZ1HFT
|
HI Steve,
Well just before you wrote today's reply, I pulled 2x 12ba6's from my tr4c and put them in the r4b, it improved the symptom a little bit, but still the zero pot needs to be all to way to the endpoint still(shorted). Q4(2N3877) is 100% good I pulled the original transistor and it checked out just fine even though I tried to replace with a bc547 and as I suspected it made no change, so that's out of the way. Now I did managed to find 2x12ba6's within EU borders so they are in the mail floating somewhere, but I kinda doubt it's gassy tubes(just my gut feeling). It gotta be somewhere else as I really don't get why the Zero adjustment need to be cranked all the way to ~0 ohm position.. Somewhere a resistor gotta be seriously out of specs I guess.
But Thank you very much for all your input, I surely do appreciate, please let me know if some good ideas should pop up.
73's de oz8abr Michael.
?
On Tue, Mar 5, 2024 at 2:43?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Those are okay.
If you don¡¯t have extra tubes, try swapping around the 12BA6¡¯s and see if anything changes.? Also look at the AGC circuit and make sure that the transistor (can¡¯t remember if it¡¯s Q4 or Q7 but it¡¯s the one that generates the AGC voltage) is a 2N3877 or equivalent.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Tue, Mar 5, 2024 at 5:01 AM, Michael Jensen < kavigal@...> wrote: Okay they resistors measure as follows: Both liftet from PCB R41=837 OHMS R89=557 OHMS So not horrible out of tolerances I guess.
On Mon, Mar 4, 2024 at 11:43?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Those figures don't indicate a problem. Ideally, TP2, with the preselector detuned, should read -1.35V Your reading isn't terrible. So now we need to see why you're getting S5 with no signal. On the schematic, R41 and R89, in the meter bridge circuit, should be checked.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent with secure email.
On Monday, March 4th, 2024 at 3:53 PM, Michael Jensen < kavigal@...> wrote:
@Steve Tonight's numbers :).
Cold and detuned TP2=-1.335v
30 mins TP2=-1.267v
60 mins TP2=-1.259v
I get your point about "
The important part here is if the voltage at TP2 with respect to time."
Now what is the verdict? Too much voltage drop? What do you think?
Thanks, Michael.
On Sun, Mar 3, 2024 at 11:49?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Resistance is the most important here.
We now need to measure the TP2 voltage from startup to a point long after warmup. If this value drifts towards 0V then there is a chance that you have a gassy tube.
The important part here is if the voltage at TP2 with respect to time.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent with secure email.
On Sunday, March 3rd, 2024 at 12:50 PM, Michael Jensen < kavigal@...> wrote:
HI again!
Tak for linked Glenn, kunne godt minde lidt om mit problem :). Okay enough "Danglish" .. @Steve, Thanks for taking your time to reply! Detuned and with AVC ON, TP2 voltage is-1.26, right now, I did an adjustment cold, so seems to have dropped ever so slightly after proper warm up.
RF GAIN Pot measures ~12Ohms(seem to be some capacitance) with wires attached, so guess that is quite okay.
Thanks, Michael-oz8abr
On Sun, Mar 3, 2024 at 2:11?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Michael, what is the voltage at TP2? There are other resistors in the bridge circuit and I have seen them go out of tolerance.
What is the resistance reading across the RF GAIN pot?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sun, Mar 3, 2024 at 07:09, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
See this thread:
/g/DRAKE-RADIO/topic/r_4b_agc_issues_part_trois/103544827
--
best regards,
Glenn, OZ1HFT
|
|
|
|
|
Hi Michael Warning: Be very careful - do not put your hands or probes into the receiver while turned on. Without current - remove one wire end to the s-meter. With a (variable) voltage source and a resistor find out if the s-meter works properly through the whole deflection/scale. Drake R-4B schematic: http://www.ve6kq.com/drake.html Without an antenna connected: Measure how much current goes through the wire exiting s-meter circuit between 820 ohm and 1kohm potentiometer. Measure how much current goes through the wire exiting s-meter circuit between?s-meter minus and 500 ohm potentiometer. Hi Steve / W1ES/4 do you know how much current that ought to go through the two wires? - Measure the resistors R1, R2, R5, R8, R9, R12, R13, R15, R16, R18, R142, R24, R25 and check if their value are ok - and what their values are. Measure the voltage across the tube top resistors R9, R13, R15, R16, R142 and note what their values are. Calculate the respective currents I = V/R. (some ? - danish: https://da.wikipedia.org/wiki/Kirchhoffs_love_(elektriske_kredsl%C3%B8b ) ) Sum pairwise the currents (R9, R13, R15) and (R16, R142) - and see if they somewhat matches currents you measured previously. I may have made errors - hope you or others point them out before you make your measurements. -- best regards, Glenn, OZ1HFT
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Hi Michael
Also: Find out howv much current is needed for full s-meter deflection.
--
best regards,
Glenn, OZ1HFT
|
Hi Michael
More safety: Let the Drake unlugged power plug and cable be visible to you, on your workbench, while you work on the Drake.
(Then it be much harder to get an accidently electric shock.)
--
best regards,
Glenn, OZ1HFT
|
I¡¯m not sure if the meter¡¯s resistance/current rating. Do start with a large series resistance when testing.?
I had not considered that the meter itself could be at fault. Where does the needle rest with no power?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Mar 7, 2024 at 01:02, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
Warning: Be very careful - do not put your hands or probes into the receiver while turned on.
Without current - remove one wire end to the s-meter. With a (variable) voltage source and a resistor find out if the s-meter works properly through the whole deflection/scale.
Drake R-4B schematic:
http://www.ve6kq.com/drake.html
Without an antenna connected:
Measure how much current goes through the wire exiting s-meter circuit between 820 ohm and 1kohm potentiometer.
Measure how much current goes through the wire exiting s-meter circuit between?s-meter minus and 500 ohm potentiometer.
Hi Steve / W1ES/4 do you know how much current that ought to go through the two wires?
-
Measure the resistors R1, R2, R5, R8, R9, R12, R13, R15, R16, R18, R142, R24, R25 and check if their value are ok - and what their values are.
Measure the voltage across the tube top resistors R5, R9, R13, R15, R16, R142 and note what their values are. Calculate the respective currents I = V/R.
(some ? - danish: https://da.wikipedia.org/wiki/Kirchhoffs_love_(elektriske_kredsl%C3%B8b ) )
Sum pairwise the currents (R5, R9, R13, R15) and (R16, R142) - and see if they somewhat matches currents you measured previously.
I may have made errors - hope you or others point them out before you make your measurements.
--
best regards,
Glenn, OZ1HFT
|
Yes, I have been bit by one of the meter terminals. It hurts :-). This circuit is at around 150V potential.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Mar 7, 2024 at 01:23, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
More safety: Let the Drake unlugged power plug and cable be visible to you, on your workbench, while you work on the Drake.
(Then it be much harder to get an accidently electric shock.)
--
best regards,
Glenn, OZ1HFT
|
When unpowered, S1+a hair, so very close to zero.
Have checked the following resistors so fare... Just FYI, nothing more.. R9 1.5K** Board 9 OK
R8 220K** Chassis Right Side -R OK
R12 1.5k**Board 9 OK
R13 1.5K**Board 9 OK
R16 1.5K**Board 7 OK
R17 12K* OK
R24 18K* OK
R136 1k** Chassis Left Side -R OK
R142 4.7K**Board 3 OK
R146 22K** Board 3 -- coil OK
/Michael.
On Thu, Mar 7, 2024 at 3:19?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Yes, I have been bit by one of the meter terminals. It hurts :-). This circuit is at around 150V potential.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Mar 7, 2024 at 01:23, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
More safety: Let the Drake unlugged power plug and cable be visible to you, on your workbench, while you work on the Drake.
(Then it be much harder to get an accidently electric shock.)
--
best regards,
Glenn, OZ1HFT
|
Now is the time, if you either have a spare set or have another R-4B, to swap every tube out at the same time (¡°shotgunning¡±).?
I had an R-4B that was vexing me to no end until I replaced all the tubes and then put swapped the old ones back, one at a time. I found two bad/gassy 12BA6¡¯s and a 12BE6 that passed the tube tester but was no good.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Mar 7, 2024 at 09:29, Michael Jensen < kavigal@...> wrote: When unpowered, S1+a hair, so very close to zero.
Have checked the following resistors so fare... Just FYI, nothing more.. R9 1.5K** Board 9 OK
R8 220K** Chassis Right Side -R OK
R12 1.5k**Board 9 OK
R13 1.5K**Board 9 OK
R16 1.5K**Board 7 OK
R17 12K* OK
R24 18K* OK
R136 1k** Chassis Left Side -R OK
R142 4.7K**Board 3 OK
R146 22K** Board 3 -- coil OK
/Michael.
On Thu, Mar 7, 2024 at 3:19?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Yes, I have been bit by one of the meter terminals. It hurts :-). This circuit is at around 150V potential.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Mar 7, 2024 at 01:23, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
More safety: Let the Drake unlugged power plug and cable be visible to you, on your workbench, while you work on the Drake.
(Then it be much harder to get an accidently electric shock.)
--
best regards,
Glenn, OZ1HFT
|
