Output Transistors on Old Marantz Hi-Fi (2330) -- Need Cross Reference / Sources
D. Munoz
Hi All,
Does anybody know where I can find suitable replacement
output transistors for an old Marantz (model 2330) stereo receiver.
The parts are labeled:
D665 O '7E (NPN Beta ~65)
D645 O '7D (PNP)
Each has a Marantz label.
Any help is appreciated. Please e-mail if possible
Thanks,
Dave Munoz
mu...@halcyon.com
BELJAN E
the year it is from, that will be a help. I think I have a similar
model and may know what to do.
Greg J Szekeres
In article <4r8vlv$8...@news.halcyon.com>, D. Munoz <mu...@halcyon.com> wrote:
>Hi All,
>
>Does anybody know where I can find suitable replacement
>output transistors for an old Marantz (model 2330) stereo receiver.
>The parts are labeled:
> D665 O '7E (NPN Beta ~65)
> D645 O '7D (PNP)
>
> Each has a Marantz label.
>
>Any help is appreciated. Please e-mail if possible
>
>Thanks,
>
>Dave Munoz
>mu...@halcyon.com
>
>
ago. My Japanese book didn't have them listed, guess they
were discontinued. Check your numbers again please.
If this helps good. When I used the NTE or other
crossover books they led me astray. I don't have time right now
to cross them myself.
This is from the toshiba transistor manual '87:
2SB645: 2SD665:
power amp power amp
pnp npn
Si,TMe Si,TMe
Vcbo:-200V 200V
Vceo:-200V 200V
Ic: -15A 15A
Pc: 150W 150W
Ti: 150C 150C
Hfe: 40-140 40-140
Ft: 12Mhz 15Mhz
Cob: 450pf 300pf
greg
John 015
In article <4r9ao2$6...@usenet.srv.cis.pitt.edu>, szek...@pitt.edu (Greg J
Szekeres) said:
>This is from the toshiba transistor manual '87:
>
> 2SB645: 2SD665:
> power amp power amp
> pnp npn
> Si,TMe Si,TMe
>Vcbo:-200V 200V
>Vceo:-200V 200V
>Ic: -15A 15A
>Pc: 150W 150W
>Ti: 150C 150C
>Hfe: 40-140 40-140
>Ft: 12Mhz 15Mhz
>Cob: 450pf 300pf
Those are impressive Ft specs. I wonder if they measure
up ?
I've used the MJ802/MJ4502 pair in 80 Watt Marantz
amplifiers. I'm not sure now what the rails voltages
are in the amp in question but the MJs above have served
me well.
John
OMEN
D. Munoz wrote:
>
> Hi All,
>
> Does anybody know where I can find suitable replacement
> output transistors for an old Marantz (model 2330) stereo receiver.
> The parts are labeled:
> D665 O '7E (NPN Beta ~65)
> D645 O '7D (PNP)
>
> Each has a Marantz label.
>
> Any help is appreciated. Please e-mail if possible
>
> Thanks,
>
> Dave Munoz
> mu...@halcyon.com
OR CONSOLIDATED ELECTRONICS. MAYBE MCM
D. Munoz
lvp...@ix.netcom.com(BELJAN E) wrote:
>>Does anybody know where I can find suitable replacement
>>output transistors for an old Marantz (model 2330) stereo receiver.
>>The parts are labeled:
>> D665 O '7E (NPN Beta ~65)
>> D645 O '7D (PNP)
>>
>>Each has a Marantz label.
>>
>>Any help is appreciated. Please e-mail if possible
>>
>>Thanks,
>>
>>Dave Munoz
>>mu...@halcyon.com
>Is that when they were part of SuperScope? I will check my model. Post
>the year it is from, that will be a help. I think I have a similar
>model and may know what to do.
Don't know. Howver, others have identified cross references to these
parts:
B645 = 2SB645 = SK3846 = NTE285 = PNP beta 70min, Pt=150W, Vceo=200V
D665 = 2SD665 = SK3836 = NTE284 = NPN beta 70min, Pt=150W,Vceo=-200V
I couldn't find a manufacturing date, but the company location is
given as Chatsworth, CA.
Incedently, this unit is built using all point to point wiring with
seperate boards for power amp, tuners, preamp, buffer amp and
speaker protection circuit. This making modification of the thing
farily easy. The rails run at +-66VDC.
Dave Munoz
BELJAN E
In <31D87F...@worldnet.att.net> OMEN
>> output transistors for an old Marantz (model 2330) stereo receiver.
>> The parts are labeled:
>> D665 O '7E (NPN Beta ~65)
>> D645 O '7D (PNP)
>>
>> Each has a Marantz label.
>>
>> Any help is appreciated. Please e-mail if possible
>>
>> Thanks,
>>
>> Dave Munoz
>> mu...@halcyon.com