Replacing transistors in Sony TA-F3A (which brand)

loudsubz

Canuck eh!

• Mar 2, 2006

• #1

I have 4 outputs to replace.

SK A771 B40
&
SK C1986 B10

What are some decent brands or equivelants I can replace them with?

 

loudsubz

Canuck eh!

• Mar 3, 2006

• #2

is NTE suitable?

 

EchoWars

Hiding in Honduras

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• Mar 3, 2006

• #3

loudsubz said:

is NTE suitable?

Click to expand...

No.

Code:

2SA771     pnp    80V    6A    40W    10MHz
2SC1986    npn    100V   6A    40W    10MHz

I'd use MJ15015 and MJ15016.

 

loudsubz

Canuck eh!

• Mar 4, 2006

• #4

Thanks Echo, but the current units in my amp are NOT the metal can type, which these 2 appear to be. Should I look into getting them and modifying the setup, or is there a straight drop in TO-220 type?

thanks.

 

EchoWars

Hiding in Honduras

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• Mar 4, 2006

• #5

loudsubz said:

Thanks Echo, but the current units in my amp are NOT the metal can type, which these 2 appear to be. Should I look into getting them and modifying the setup, or is there a straight drop in TO-220 type?

thanks.

Click to expand...

Oops...well, you didn't say what they were. Post a pic if you can (TO-220's are really only used for output devices in amps that are rated for less than 20WPC.)

 

loudsubz

Canuck eh!

• Mar 4, 2006

• #6

My appologies for not stating.

Im not sure the case was TO-220, but it was that style compared to the metal can type.

Here are 2 pics:

 

EchoWars

Hiding in Honduras

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• Mar 5, 2006

• #7

Wow...sure do like like TO-220's. If so, use the MJE15032 and MJE15033.

 

Yamaha B-2

registered user

Banned

• Mar 5, 2006

• #8

Think this is the matching Sony tuner, which would make for a nice set. http://cgi.ebay.com/Vintage-Sony-FM...863960717QQcategoryZ39790QQrdZ1QQcmdZViewItem

 

Unda Maris

Mr. V-FET

• Mar 8, 2006

• #9

EchoWars said:

Wow...sure do like like TO-220's. If so, use the MJE15032 and MJE15033.

Click to expand...

EchoWars, did you ever used them as power transistors (single pair) ?

They are for sure a nice replacement for the original transistors (parameter wise), but way too weak for a power amplifier ...
I think these were designed as high voltage driver transistors.

What about MJW21193/MJW21194 ?
These are TO-247 versions of the MJ´s and should fit the board/heatsink, since it looks like, as if the board originally was designed for TO-3P transistors, which have almost the same dimensions like TO-247.

 

Last edited: Mar 8, 2006

Nakdoc

nakamichi spoken here

• Mar 8, 2006

• #10

Help me understand...why use subs when the originals are available at Parts Express, MCM, or just about anywhere???
Subs are a last resort, in anything that is not a power supply.

 

EchoWars

Hiding in Honduras

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• Mar 8, 2006

• #11

Generally agreed, but in this case, the MJE parts are a substantial improvement.