Late 1960's BFO

[jap]

Hi Skippy
about pdf TOKO 10k thanks to homefire ,T1 the same but pin#2 worked.
-Will rely on measuring ohms between the pins1,2,3 - 4,6 and converted into the number of tu in case it was do not get it new,with the help of pdf to Find out How to make T1 on the shape of Old.
best time.
j.

[jap]

Hi Skippy
For in the loudspeaker OK,for the rest of the Mis- NOT(all errors in red lines).
I hope that you are comparing picture V03 with your pcb And you will understand.
-What are the specifications of the coil? Please draw the coil.
-For HECTOR modified, I will not put any modification In order for him modified.
-And if there are some mistakes in my modified picture V03 I hope the correction, I do not have pcb.
best time.
j.

[Skippy]

Maybe you should post an updated 'error' drawing, jap. Many errors have been corrected now. I can't see any error in the loudspeaker connections?
The pdf on rewinding toko transformers was interesting, but this one on Hectors cct looks like the Toko 10Z / 10EZ series, which are slightly different inside.

[jap]

Re again

Found many more errors.
Never thought that I'd make so many mistakes.
No more drinking while working on PCB's

Hi HECTOR
what do you do? - you Do not see my picture V03 !!, i have sacrificed for you all errors in red lines.
Re again --every green lines is true will not touch it again . -all lines & Components in red lines wrong must be re-placed .
-Please draw the coil.
best time.
j.

[Skippy]

That's a bit more like it. Caps C9,C4 will be 1nF, I think. C3 seems a bit high at 10nF, it could be 1nF, worth re-checking it. Not to appear repetitive, R4,R12,R14 need the values correcting.

[HECTOR]

Thought it would be good to put these close together.

[HECTOR]

Found many more errors.
Never thought that I'd make so many mistakes.
No more drinking while working on PCB's

[homefire]

Some Info that may help you with that Transformer.

http://g4hup.com/DFS/Rewinding%20Toko%2010k%20Series%20Coils.pdf

[HECTOR]

Thanks Jap!
My first guess matched the ebc markings on the trace side of the PCB. They should be true and correct. The speaker connection checks out OK.
I did an impedance test with the stand alone search coil and and there was a 2X voltage gain @950KHZ.
It's a 5 turn, 5"OD paired loop, shielded coil of something like #24 stranded. Just under 1 ohm resistance. I don't have an inductance meter. Any suggestions on a good bargain meter?

[jap]

Hi HECTOR
Clear from the drawing that the mistake in each Q1.2,3,4 type EBC. the way to convert - to follow all Q EBC to Each Q EBC And see each item up to the points and so on.
- -What are the specifications of the coil?
- There is an error in connected R20.
-Its clear see my picture V03 .!!
best time.
j.

[jap]

Hi Skippy
-removing T2 from the PCB must with special care in order to not damage .(with not use violence ) taking the time .there the ways to remove the tin easily from PCB,With no damage to the component and PCB.
-(T2)10mm transformer(A critical piece) .
best time.
j.

[HECTOR]

Top side of L1 should go between C9&C10! Not C6.

[HECTOR]

At least I saved a jpeg version to reproduce all my work tonight. I mistakenly hit "NO" when it asked me if I wanted to save
Never even checked to see if it would run without any errors.
I know it's getting VERY close.
Some of the cap #'s are not familiar.
Note ferrite coil operating freq 662KHZ (center) Only guessing transformer symbol for ease of pinout ID. Output sine wave is on the top third pin to the right. Pre amp sine is top left

[Skippy]

Although the 10mm transformer will need removing from the PCB to assess it properly, it would be worth doing a continuity check on it in-circuit, to help eliminate some winding configurations. These transformers have a pin numbering system that is like DIL I.C's, so this one will have pins 1,2,3,4,6

[jap]

Hi Skippy
correction true.
(There are more than mis-)
J.