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 My 'Little General' for 1976 Part one.
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 Return to top of page · Post #: 1 · Written at 8:07:04 AM on 8 September 2019.
Fred Lever's Gravatar
 Location: Toongabbie, NSW
 Member since 19 November 2015
 Member #: 1828
 Postcount: 569

Well I have done it again, started another "Little General" but this time 30 years on from my last "1946" model.
I'm using TV type valves and some silicon diodes in this one, allowable in the 70's.
As usual I am scratch building, using junk and my wits.
This first part covers knocking up a chassis, fettling the power and output transformers and sorting out some tuning coils, RF and IF.
I'll send the usual PDF to Brad to tag to this post.

Fred.

Little General 1976 - Part 1


 
 Return to top of page · Post #: 2 · Written at 10:48:00 PM on 8 September 2019.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 5497

Document uploaded.


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

 
 Return to top of page · Post #: 3 · Written at 10:23:17 PM on 9 September 2019.
Tallar Carl's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 1403

Wow I wish I had your patience.


 
 Return to top of page · Post #: 4 · Written at 8:28:59 AM on 10 September 2019.
Arty41's Gravatar
 Location: Brisbane, QLD
 Member since 18 September 2010
 Member #: 118
 Postcount: 289

Wish I had your knowledge. How do you unwind and rewind that fine wire without breaking it ? Do you do it by hand ?


 
 Return to top of page · Post #: 5 · Written at 6:57:35 AM on 12 September 2019.
Fred Lever's Gravatar
 Location: Toongabbie, NSW
 Member since 19 November 2015
 Member #: 1828
 Postcount: 569

Hi, yeah patience...………..I do like making intricate things and worrying them into working.
Probably because I don't quite understand how things work so get a better idea by making something.

The coils do have fine wire but that litz wire is surprisingly strong and can take a bit of jerking without breaking.
As I need a counter I use my little transformer winding machine fixture.
On that I can wind small transformers using a centre spindle to hold the coil former tight.
An IF transformer or tuning coil is a bit tricky as I cannot put a 3/8" spindle through those so just tape them to a block and wobble around.
The wire can sit on a bobbin and unthread onto the new coil. I may also be unwinding off one transformer direct to the next.
Old IF's with wax coverings are a blessing as the wire comes off easily.
No I cannot "honeycomb" wind but I just pile the turns on and wobble a bit to get a bit of cross weave!
I could make up a taper spindle auto feed honeycomb wind machine but I am not going to!!!!!
This radio thing is just a hobby not a business, I gave up running a business decades ago...………..

Fred.


 
 Return to top of page · Post #: 6 · Written at 10:32:02 AM on 12 September 2019.
Arty41's Gravatar
 Location: Brisbane, QLD
 Member since 18 September 2010
 Member #: 118
 Postcount: 289

Any chance of a picture of your little transformer winding machine fixture ?


 
 Return to top of page · Post #: 7 · Written at 8:33:00 AM on 15 September 2019.
Fred Lever's Gravatar
 Location: Toongabbie, NSW
 Member since 19 November 2015
 Member #: 1828
 Postcount: 569

I'll take a few photos of the winder and post those in the workshop section.
Might also take a few photos of the workshop and post those as well.

Fred.


 
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