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 Valve Signal Generator
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 Return to top of page · Post #: 31 · Written at 11:10:23 PM on 26 January 2017.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6002

 
 Return to top of page · Post #: 32 · Written at 6:30:20 PM on 9 April 2017.
Tallar Carl's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 1573

Hi people I have sent some photos in of mine . I have a few questions . One of the caps across the active has blown apart I believe . Am I correct in putting the new one from active to earth as I can't see any hint of where it may go.
My next question is about the double 10μF Cap with the .100μF bypassing it. Are both the 10μF s negative to ground?. I ask this because one end of it has the two connections but one of them is red.

Signal Generator
Signal Generator
Signal Generator
Signal Generator
Signal Generator


 
 Return to top of page · Post #: 33 · Written at 8:36:12 PM on 10 April 2017.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
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 Postcount: 6342

Photos uploaded to Post 32.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 34 · Written at 7:07:48 AM on 12 April 2017.
Tallar Carl's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 1573

This one is the model before the one discussed here. Sorry I just realised that.


 
 Return to top of page · Post #: 35 · Written at 8:48:21 PM on 13 May 2017.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4333

There are two different manufactures of "Leader" LSG 11 and those, in this last set of photo's are oil filled caps. The ones in the one I have here, surplus to requirements, (serviced with new valves) were them: Tested they failed leakage, get rid of them.

Those mains caps are not critical to its operation but will get rid of RF, which I have plenty of, riding on the mains. Normally I put a 0.1mfd Broadside N to A and one of not more than 0.01mfd Active to Earth, with three wire cable fitted.

RG5236, RG5230 Are some Jaycar line caps (AC mains Caps) Typically these have voltage 275~; 275VAC and several standards association stamps on them like "UL".

Accuracy and band spread were an issue in some units like it. I calibrate with a counter (tone / modulation must be off). There are some cheap counter modules around.

LSG-11 has a blocking / signal reducing cap in the output, which the clone I have, has not. Most of those output via the cathode, which keeps the voltage down.

With the one I have you can use the crystal to zero beat against to get a frequency like 455HHz spot on.


 
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