Data for Motorola SS47 and SPS439 transistors please? - diyAudio
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Old 15th March 2013, 08:31 PM   #1
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Default Data for Motorola SS47 and SPS439 transistors please?

Hello all.

I need some data/specs on some old Motorola transistors: SS47 and SPS439, both are NPN transistors. They were used in a Marantz 240 amp in the 70s. I cannot find any data on them online. Some people posted on possible replacements for those transistors, but I would still like to see their specs if possible.

Can anyone with a Motorola data book help look these up, please? Or could someone at least point me to which data book to buy?

Many thanks!
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Old 15th March 2013, 11:49 PM   #2
Enzo is offline Enzo  United States
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I am not familar with those parts, and they don't show up in my listing, but others may have more information.

Are you sure those are not Marantz house numbers on the parts. Moto made huge numbers of parts labeled for OEMs.
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Old 16th March 2013, 12:00 AM   #3
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http://www.alldatasheet.com/view.jsp?Searchword=SPS439

Can you check what is printed on the transistors as I have data books from Motorola dating back to 1966 and cannot find a listing for that type of number. Usually MPS would start the type number but alas,
http://www.alldatasheet.com/view.jsp?Searchword=MPS439

Would they be the output transistors, SJ2510 and SJ2520?

Last edited by JonSnell Electronic; 16th March 2013 at 12:04 AM. Reason: More info
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Old 16th March 2013, 02:35 AM   #4
Enzo is offline Enzo  United States
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Harleyjohn, I found that too, but going to it I find it says "no data" and I can't find a data sheet on the page. Did you pull up an actual data sheet from that? If so, where is it on the page?
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Old 16th March 2013, 03:42 AM   #5
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Unfortunately, those were the exact imprints on the transistors. Below are the pictures I just took of those exact two transistors.

I'm also attaching the schematic where they are used: in the rectifier/relay board of Marantz 240 amp.
Attached Images
File Type: jpg Motorola_SS47.jpg (224.5 KB, 31 views)
File Type: jpg Motorola_SRS439.jpg (275.6 KB, 28 views)
File Type: jpg Marantz_240_Rectifier_Relay_Board.jpg (135.2 KB, 27 views)
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Old 16th March 2013, 05:16 AM   #6
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I'll give you at least 2:1 odds that these are manufacturer's house numbers, not Motorola numbers.

Where is the freewheel diode (a.k.a. snubber diode, kickback diode, et al) for relay K301? If these two transistors are in fact defective, the absence of a diode across the K301 coil may be part of the reason. It looks like the circuit designer tried to impress somebody (or just be cute) by using the time constants associated with capacitors C301 and C302 to smoosh K301 through its turn-on and turn-off rather than let it switch sharply. Of course, this will tend to increase contact chatter and wear. C301 and C302 are now 40 year old electrolytic capacitors so they are candidates for replacement on general principles, even without the suspicion that they may have contributed to the failure of Q302 and Q303.

The two transistors themselves are used as a rather unexciting Darlington switch for the K301 coil. Looks like Q302 needs to carry about 100 mA max, and withstand around 60V (plus the turnoff transient generated by K301). It's tough to find anything in a TO-5 or TO-39 package anymore. If you can get a genuine 2N3439 or 2N3440 give them a try - they're high-voltage switching transistors and should be able to swallow some of the spike coming off K301. If you can't get them, try an MPSW42 and bend the leads to fit the PWB pattern.

Q303 should also have a high enough voltage rating to make up for the circuit designer's short sightedness - beyond that it can be just about any run-of-the-mill NPN amplifier with an EBC pinout. Try an MPSA42.

Dale

Last edited by dchisholm; 16th March 2013 at 05:18 AM.
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Old 16th March 2013, 07:35 AM   #7
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There is no data available.
Is it the output transistors that you need?

Last edited by JonSnell Electronic; 16th March 2013 at 07:36 AM. Reason: Spelling
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Old 16th March 2013, 09:48 AM   #8
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No spec given on the relay, but 24V signal relays usually have coil resistance around 1k. The 560R 5W in series is a voltage dropper as the supply is far more than 24V.

This means that Q302 dissipates a few watts peak during switching, but much less in the steady state . Q303 needs a decent current gain, but only about 1mA current.
I would use a something like a BD130 and a MPS42. Also add a 1N4004 in reverse across the coil
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Old 16th March 2013, 10:09 AM   #9
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Almost anything will do in these positions. The 2N3439 has an interesting simile with the SPS349 !
There is no need for a clamp diode as the series resistor acts as a snubber. If one was needed it wouldn't last almost 40 years before going wrong. Check the DC levels on the output stages of course as if it is incorrect, the relay will not trigger.
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Old 16th March 2013, 04:41 PM   #10
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Someone who rebuilt a similar rectifier board in a Marantz 32 used an Omron MY2 relay, which seems to be the right candidate.

Alright, let's catalog replacement suggestions (suggestions from other sources/websites noted with a star *):

Q301, Q303 (SPS439):
MPSA42
*BC546B (or 2N5235)
*2N3859A

Q302 (SS47):
2N3439
2N3440
MPSW42
BD130
*MJE182G

Someone with a Marantz 32 (similar rectifier/relay board) measured those original transistors. Original Q301, Q303 (SPS439) give approximately BETA = 100. For Q302, BETA = 60. But again, it's possible that Marantz 32 could have slightly different specs for this board than Marantz 240.

Here's how Marantz describes operation of the relay/rectifier board in Marantz 240 amp:

Quote:
The output of the power amplifier is applied to the wipers of relay K301 on the rectifier relay board. Relay K301 energizes after a minimum delay of 2 seconds after turn on. The length of the delay is a factor of the time constant of R306, R309, and C302. This delay at turn-on is to prevent any transient surges from reaching the output terminals.

Additionally, resistors R302 and R305 sample the audio output signals. Should a constant DC level over +4.5V or a high-amplitude signal below 10Hz be present, Q301 will turn on, shorting the base of Q303 to ground. C302 begins to discharge, and K301 relay de-energizes.

The relay test in the service manual says that if a 5-Hz signal is fed into the amplifier, the relay should disengage when output voltage is 25.5-33.5 volts.

If a constant DC level over -4.5V is present, the voltage drop across R304 bucks the voltage present at the base of Q303, making K301 relay de-energize.

The output from K301 is applied to the speaker terminals.

86.5 Volts AC is applied to CR301--CR304 (rectifier bridge) which develop +58V and -58V for the power amplifier board. CR305 and CR306 develop the positive voltage to energize K301.
Admittedly, I am not an electrical engineer, and I still struggle to make calculations of voltages/currents on boards like these... But maybe someone could explain to me what kind of voltages are present at the bases, collectors, and emitters of Q301, Q302, and Q303 in the two different modes of operation (Relay on, Relay off).
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