Old Amplifier SAE mkIII

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#21
Re: Re: Re: Bias diodes

ManUtd said:


Hi Elso!

Could You see in Your scematic what value is used for the resistor between those 1N4004?
I think i have to change thisone if i use 1N4004.

Reg,
ManUtd
Click to expand...

Hi ManUtd.
The IIICM is an other amplifier!
The IIICM is a full complementary design while the III has a quasi complementary outputstage.
Best get a schematic for yours.
See f.a. http://home.pacbell.net/tbirdsc/schematics.htm
The schematic for the III is free! Just send the nice guy Jim an email.
As a last resort you could try this cosy forum:
http://groups.yahoo.com/group/SAE_Talk/
 
#22
Hello ManUtd

If you have problems getting the schematics, send me a mail. I'll attached the Mk III over to you.

You will notice that two 1N3754 diodes are used for biasing. These diodes were once popular because they come with metal taps making them convenient to use for temperature compensation. You will probably find one of them connected to the heatsink.

If you plan to replace the 1N3754 with the 1N400X, you may run into difficulties in ensuring good contact between 1N400X and heatsink. One way to get round this is to use a TO-126 transistor instead. Just wire it as a diode and screw onto heatsink. Make sure you use a mica for insulation.

Regards
 
#23
You keep refering to a SAE 601 amp. I've never heard of this version. Was it for overseas or something? I"ve been messing around with SAE for the last 10 years and have owned more than can be rationalized. You can find lots of tech data and a parts cross reference on my site: Wardsweb.org

I even flew out to California to meet Morris Kessler (founder/owner of SAE). Also, keep in contact with James Bongiorno (original designer).
 
#24
SAE 601

Wardsweb said:
You keep refering to a SAE 601 amp. I've never heard of this version. Was it for overseas or something? I"ve been messing around with SAE for the last 10 years and have owned more than can be rationalized. You can find lots of tech data and a parts cross reference on my site: Wardsweb.org

I even flew out to California to meet Morris Kessler (founder/owner of SAE). Also, keep in contact with James Bongiorno (original designer).
Click to expand...

Hi,
SAE 601 is a stamped on partnumber.
But it is that old I could not find a replacement in my list for SAE vs. generic partnumbers like 2N****.
😎
 
#26
SAE601

Wardsweb said:
oops, my bad. I should read slower. If you wish to ask James Bongiorno about this, his email is sstinc@earthlink.net
Click to expand...


I bet James will recommend the MJ21194's !
I am almost sure but you can ask. James is using these parts together with its sister/brother MJ211934 in the Ampzilla2000.
But I second djk's suggestion that the MJ15022 or 15024 are quite usefull too.😎
 
#27
L1 ??

What size is L1?
It looks like a resistor to me,but it is burnt.
Scematic says it is an coil L1.
Scematic says Coil is between black speaker connection and ground/chassi but in real it is a 12R 1W resistor.
Anyone with correct information about this?

Reg,
ManUtd.
 
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