Peavey transistors

Ron Thomas · 2nd April 2010, 01:15 PM

Hi to anyone who can help,
A Peavey Heritage has 2-6465 T0-3 case NPN and 2-6531 T0-92 case NPN transistors in the output circuit..
Tell me this is a 6465 a 6465 no matter who makes them.
Is the number on a transistor is a standard throughout the transistor world.
A Sylvania 6465 and a Motorola 6465 is the same transistor, RIGHT?
Thanks to who ever can guide me here.

Aldotin · 2nd April 2010, 03:14 PM

6465 = MJ4247
6531 = MPS6531

Took 1 minute using Google

llwhtt · 2nd April 2010, 04:04 PM

This from the Peavey semi-conductor cross reference list:

MPS6531=2N3642 Peavey# 70406531

SJ6465=MJ4247 No longer available from Peavey

Google "peavey semi-conductor cross reference"

Craig

wg_ski · 2nd April 2010, 04:45 PM

So, what is the wattage, ohms, supply voltage - and how many MJ4247 in parallel? (and is the collector positive or negative?)

llwhtt · 2nd April 2010, 04:54 PM

wg ski,

There are only two MJ4247s, each one drives the cathodes of two 6L6s. The two 6530/31s seem to be VI limiters as per a normal solid state output section. I can email the schematic if you are interested.

Craig

wg_ski · 2nd April 2010, 05:31 PM

PM sent. The last time I saw this it was just one 6L6 per driver transistor - and they were TO-220. One side was still ok, and it just looked like a run of the mill transistor. I used a TIP41C and it was fine. Currents are just plate current, and cathode voltages just don't get that high - especially in pentode. I'd just need to confirm whether or not it needs a darlington or just a regular one. The circuit was just a current source, modulated by the audio with an op amp referred to the negative bias rail.

llwhtt · 2nd April 2010, 06:27 PM

Some Musicman amplifiers used this type of drive, they are/were TO220 type transistors. There were both 50 and 100 Watters.

Craig

Ron Thomas · 2nd April 2010, 10:11 PM

Hey Guys,
Thanks ever so much for all this help.
I thought that I was somewhat right.
I have found them at Antique Electronic
Supply out of Arizona.
Now to get them ordered and get this
Peavey Heritage goin'!
Thanks again!
Awesome!!
Ron

llwhtt · 2nd April 2010, 10:12 PM

wg ski,

I didn't get a PM yet, maybe try again.

Craig

Enzo · 3rd April 2010, 06:42 AM

6465, or SJ6465, is just a Peavey part number, NOT an industry number. SO you won't find them in Moto or Sylvania catalogs. the part is a Moto MJ4247 as someone pointed out. Even if the part is not available, you can still look up its data sheet.

The MJ4247 is a 120v 8A part, cinsiderable overkill. As is the TO3 package. But later Peavey models like the Classic VTX used a more modern part in a TO220 in the same application, as did Music Man in many models as someone pointed out. The Peavey house nunber was 5884, but those were MJE15030.

MJE15030 is a 150v 8A part with plenty of dissipation. MJE15032 is a 250v 8A, and MJe15034 is 350v 8A, if you want to goose the specs a little. You would have to mount them where teh TO3 was, but that should not be mich of a challenge.

And as someone noted, the 6531 is an MPS6531. PV also lists the 2N3642 as a sub. MPS6531 is available at Mouser for 7 or 8 cents each.

Cathode voltage on the 6L6 will be about 90VDC at idle. The control grids are set at about +15VDC. Idle current is about 10ma. These run at close to class B.

2nd April 2010, 01:15 PM	#1
Ron Thomas diyAudio Member Join Date: Apr 2010 Location: Oklahoma	Peavey transistors Hi to anyone who can help, A Peavey Heritage has 2-6465 T0-3 case NPN and 2-6531 T0-92 case NPN transistors in the output circuit.. Tell me this is a 6465 a 6465 no matter who makes them. Is the number on a transistor is a standard throughout the transistor world. A Sylvania 6465 and a Motorola 6465 is the same transistor, RIGHT? Thanks to who ever can guide me here.

2nd April 2010, 10:11 PM	#8
Ron Thomas diyAudio Member Join Date: Apr 2010 Location: Oklahoma	Peavey transistors Hey Guys, Thanks ever so much for all this help. I thought that I was somewhat right. I have found them at Antique Electronic Supply out of Arizona. Now to get them ordered and get this Peavey Heritage goin'! Thanks again! Awesome!! Ron

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2nd April 2010, 03:14 PM	#2
Aldotin diyAudio Member Join Date: Dec 2009	6465 = MJ4247 6531 = MPS6531 Took 1 minute using Google

2nd April 2010, 04:04 PM	#3
llwhtt diyAudio Member Join Date: Jun 2008	This from the Peavey semi-conductor cross reference list: MPS6531=2N3642 Peavey# 70406531 SJ6465=MJ4247 No longer available from Peavey Google "peavey semi-conductor cross reference" Craig

2nd April 2010, 04:45 PM	#4
wg_ski diyAudio Member Join Date: Oct 2007	So, what is the wattage, ohms, supply voltage - and how many MJ4247 in parallel? (and is the collector positive or negative?)

2nd April 2010, 04:54 PM	#5
llwhtt diyAudio Member Join Date: Jun 2008	wg ski, There are only two MJ4247s, each one drives the cathodes of two 6L6s. The two 6530/31s seem to be VI limiters as per a normal solid state output section. I can email the schematic if you are interested. Craig

2nd April 2010, 05:31 PM	#6
wg_ski diyAudio Member Join Date: Oct 2007	PM sent. The last time I saw this it was just one 6L6 per driver transistor - and they were TO-220. One side was still ok, and it just looked like a run of the mill transistor. I used a TIP41C and it was fine. Currents are just plate current, and cathode voltages just don't get that high - especially in pentode. I'd just need to confirm whether or not it needs a darlington or just a regular one. The circuit was just a current source, modulated by the audio with an op amp referred to the negative bias rail.

2nd April 2010, 06:27 PM	#7
llwhtt diyAudio Member Join Date: Jun 2008	Some Musicman amplifiers used this type of drive, they are/were TO220 type transistors. There were both 50 and 100 Watters. Craig

2nd April 2010, 10:12 PM	#9
llwhtt diyAudio Member Join Date: Jun 2008	wg ski, I didn't get a PM yet, maybe try again. Craig

3rd April 2010, 06:42 AM	#10
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	6465, or SJ6465, is just a Peavey part number, NOT an industry number. SO you won't find them in Moto or Sylvania catalogs. the part is a Moto MJ4247 as someone pointed out. Even if the part is not available, you can still look up its data sheet. The MJ4247 is a 120v 8A part, cinsiderable overkill. As is the TO3 package. But later Peavey models like the Classic VTX used a more modern part in a TO220 in the same application, as did Music Man in many models as someone pointed out. The Peavey house nunber was 5884, but those were MJE15030. MJE15030 is a 150v 8A part with plenty of dissipation. MJE15032 is a 250v 8A, and MJe15034 is 350v 8A, if you want to goose the specs a little. You would have to mount them where teh TO3 was, but that should not be mich of a challenge. And as someone noted, the 6531 is an MPS6531. PV also lists the 2N3642 as a sub. MPS6531 is available at Mouser for 7 or 8 cents each. Cathode voltage on the 6L6 will be about 90VDC at idle. The control grids are set at about +15VDC. Idle current is about 10ma. These run at close to class B.

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