Doing nothing special, just listening to my SB-101 a puff of smoke came from the HP-23 Power Supply. Upon checking things out I found that both of the fuses in...
Caution!! I dug deep on the net, and found 6146B's & 6146W's not recommended for use in the Heathkit rigs, because of the neutralization problems. I bought...
Unhook the secondary and use a variac to slowly bring up the primary.if its partially shorted,it`ll start heating up. Also BEFORE you do this put a fuse inline...
I wrote"I would do less than an amp cuz without the secondary load on it,it won`t ... That is if its NOT having shorted turns! If a ,say 500 Ma fuse blows you...
You can also build a "Dim Bulb Tester" Where the light bulb takes the place of the fuse. http://antiqueradio.org/dimbulb.htm Walt - WB2VSJ ... From:...
Happy New Years to all! I have been buying Test Equipment online for a month now. I am setting up a repair bench so that I can get back into electronics as a...
Transformers don't short just by themselves. Something causes it. That supply should have had a proper fuse installed and the plug/cord changed! Bob Macklin ...
In a message dated 01/01/2012 11:35:11 GMT Standard Time, esrman@... writes: Unhook the secondary and use a variac to slowly bring up the primary.if...
Because these are very good advice/information, these links are provided with full credit to Tim Reese and Amateur-Repairs@yahoogroups.com. ... Van wd8aam ...
Because these are very good advice/information, these links are provided with full credit to Tim Reese and Amateur-Repairs@yahoogroups.com. ... Van wd8aam ...
Hi Ted, I've read the Heathkit service bulletins that initially warned about using 6146Bs and also Glen Zook, K9STH's information on the 6146 family of tubes....
The HP-23 power transformer's primary winding resistance is between 4.5 and 5 ohms. A resistance of 1 ohm or less clearly indicates a bad primary winding. I...
A lot of folks seem to believe there is a "significant difference" in inter-electrode capacitance between the 6146/6146A and the 6146B tubes. Actually there is...
Start with something simple. Normally the fuse will blow before the transformer is damaged. To me the fact that BOTH fuses were blown says it was probably not...
AC power transformers can quite often read around 1.0 to 1.5 ohms on a DC ohm meter. It has been my experience while troubleshooting many 100 Watt class tube...
Hi Neil, Thank you for your suggestion. Yes I have the manual and the schematic so I will look into that angle as well. Thanks again for your help. I'll pass...
Thank you Bob for your suggestions. Since I have the schematic, it shouldn't be too hard to navigate those areas. I'll pass on whatever I find out. Best...
Hi George, Thank you for your insight. I did test the caps and they check out ok. As for the diodes, that will be my next step. Since I have the schematic, it...
I'm not going to get into the DeOxit vs. anything else discussion, as that topic has been extensively commented on before. I don't have any experience with...
Hello, I have a IM 2410 and IM 2420 in my test equipment collection. My question is can I use either one to measure remote control signals (49.860 MHZ) and how...
That would depend on how you want to measure the frequency? Direct Input? Via antenna? The IM-2420 requires 25mv RMS at its input to function. That's a tad...
The counter will probably not give an accurate reading. The RC transmitter is pulse modulated. But assuming it is one of the FM modulated transmitters it...
I'm not sure what the power output of the RC would be, I wouldn't think its much being used for RC type toys. I just want to be able to check the signal coming...
The most reliable method would be to use a transfer oscillator. You listen to the unknown with a receiver and zero beat a fairly stable oscillator while...
Hello all, I'm trying to troubleshoot a umatic keyer. I don't have a manual or schematic. So far, I cannot get the dit paddle to work. If I plug in an...
I recently resurected an O-12 scope from storage. It worked fine for a time then suddenly went died. Turns out one side of the HV winding is shorted. I would...
You say "paddle". You do have two, right? Lou wa5bng tulsa From: heathkit@yahoogroups.com [mailto:heathkit@yahoogroups.com] On Behalf Of James H Sent: Sunday,...
There is an IO-12 in the boneyard at: http://www.D8aPro.com ... -- Don Peterson Data Professionals 1807 Santa Rita Road Suite D PMB 277 Pleasanton, CA 94566 ...
