TESORO GOLDEN SABRE

[mazari31]

good day everyone I just finished my tgsl may the problem
and a depth part 1 euro 13 cm may following a booming mass as a pence
about 30 cm made coil House Jet mi has the place
of r45 24 k r48 r51 220 k

[matrix]

AUDIO MOD

OK. the problem with audio solved, using a mod circuit of other TESORO schematic (using bd140).
but sensitivity and disc are both having problems and noises are strongly available.
may be because of my replaced parts.
may jfet 2sk246 is not good replacement for bf245, or lm308 cant replaced by ne5534
anybody can help?
best wishes
M

[dfbowers]

OK. the problem with audio solved, using a mod circuit of other TESORO schematic (using bd140).
but sensitivity and disc are both having problems and noises are strongly available.
may be because of my replaced parts.
may jfet 2sk246 is not good replacement for bf245, or lm308 cant replaced by ne5534
anybody can help?
best wishes
M

It might be helpful to show which schematic you are working from as there are so many. The most common FET used in the TGSL is a J107 but bf245a,b,c work. I have even used an MPS102 without any noticable difference.
For LM308 go with a TL061, (Low power) TL071 (low noise) or TL081(low cost) .

[porkluvr]

... sensitivity and disc are both having problems and noises are strongly available.
may be because of my replaced parts.
may jfet 2sk246 is not good replacement for bf245, or lm308 cant replaced by ne5534
anybody can help?
best wishes
M

Ouch. Um huh you answered your own question.


The FET replacement would probably be OK (but not the best) but you need to swap the pins.

BF245 goes DSG looking at the bottom with flat side up. 2SK246 goes SGD.

NE5534 is a good amplifier but not for where you're wanting it. I'll add OP07 to what Don suggested you could try.

Even better would be OP08 or LT1008 (but "good luck" with finding these, as they really are 'exact' replacements for 308.)

[matrix]

dfbowers and porkluvr , thank you .
i am going to provide some parts with your helpful answers today.

best wishes
M

[matrix]

hello friends
i came back with full hands, obtained lm308 from an old dealer in an old store...
Nice
but jfets are not available yet
bf245
bf256
j107
tis75
2n5458
bfs76
and etc...
i just find these : k246----2n3819----bs107(bs107 was a dealer proffer).
And now again need some friend's opinion who guides beginners at all.


best wishes
M

[satdaveuk]

Hi
I found the LM308 to be the most stable, tried the 0p07 which gave me instability , but saying that different builds will have different results due to there been so many varibals in the rest of the build.
So worth experimenting with different parts but keep in mind what works for one persons build doesn't mean it will be success for yours and visa versa .

[matrix]

Hi
Yes, it is very stable, now i have to find problems that in disk mode, sensitivity is very low and in all metal mode detects a nickel 1.5cm coin from 20cm
my be hand made coil is not effective otherwise , jfets 2n3819 are not suitable this place.
after these have solved, will try with similar parts of course
maybe...
op07 , op77, tl081 , tlc271

[porkluvr]

Hooray for finding LM308.

BS107 MOSFET will be NO good!

I think 2N3819 is a hit-or miss deal. Some will work OK, and some will not. You should look for something better.

Try to find 2N5484, 2N5485, 2N4393, J112, J113.

k246 (2SK246) should work OK, but you do need to twist 2SK246 leads to where they match the PCB.
Here is good place for datasheets.

edit: this is a re-edit. Some of the FETS listed here have leads that are 180 degrees away from the others and you should download and review appropriate device datasheet, and adjust, before you use these devices as substitutes. DONE.

[matrix]

Hooray for finding LM308.

BS107 MOSFET will be NO good!

I think 2N3819 is a hit-or miss deal. Some will work OK, and some will not. You should look for something better.

Try to find 2N5484, 2N5485, 2N4393, J112, J113.

k246 (2SK246) should work OK, but you do need to twist 2SK246 leads to where they match the PCB.
Here is good place for datasheets.

edit: this is a re-edit. Some of the FETS listed here have leads that are 180 degrees away from the others and you should download and review appropriate device datasheet, and adjust, before you use these devices as substitutes. DONE.

OK . again I will try to find them
Thanks for supports and link,
I seems lucky having new good friends... and better English of course

[paku]

hello im new here!
i need help!
in my country cannot get bf245c and j107,
so what is the best replacement for this part

[porkluvr]

hello im new here!
i need help!
in my country cannot get bf245c and j107,
so what is the best replacement for this part

Didn't somebody already answer that same question? Just the other day. (I swear to God, it was just the other day.)

[paku]

can u give me the answer link of this question i dont find i have reead 203page on this thread
can u help! give me the link

[satdaveuk]

Hi Paku
You may get away with MPS 102, 2n5457, 2n5484, J201, or Toshiba SK170 but keep in mind its paramount you get the pinout ids correct.
The first three I mentioned normally are reverse connections compared to the BF245A-B and C but dont take my word for it get pinouts from the manufactures of the particular transistor you obtain.

[satdaveuk]

Hi
Also forgot to mention about C14 ... try and get hold of the proper 4.7mfd bipolar capacitor rather than series with two 10mfd because that component is critical and needs to me 4.7mfd, Allot of discussions gone on in the past about that one and I am not convinced that back to back series with two 10mfd does the job accurately enough.