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Sherwood SEL-400 Int Amp - Strange Power Issue

Just acquired a beautiful-condition Sherwood SEL-300 tuner and SEL-400 integrated amp. While the tuner is fine, the 400 powers up without turning it on! Checked with headphones, and all you get is static and a faint signal through all incoming channels - and a loud hum. Have not and will not test with speakers until issue addressed. The unit appears to have not been tampered with, fixed, etc.
I'm no expert, but no dummy with vintage gear, either, and have never seen this problem before. Anyone have any insight?

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I have one with the exact same problem. I think it is in the protection circuit. I am waiting for my tech to have the time to recap and fix it.

Posted on Aug 15, 2010

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Integrated Amp to Power Amp


Unfortunately, there is not. You risk over driving the amp if you do that

Jan 27, 2014 | Amplifiers & Preamps

1 Answer

NAD M3 power light turns red immediately and PROTECT message displays. Amp keeps functioning but volume control doesn't work up or down.


Hello
Check the connection to speaker with this amp, for any short or any other fault. disconnect the outputs, ie, speakers from the amp, and switch it On, and see the protect display comes or not. If it comes, the fault is internal and the set need service.
Your M3 dual Mono integrated amp, is of high output power and its outputs are protected against any overload or short circuit. If the system detect any among this condition specified above, it will show protect mode display.
Never load this amp, as protection display is there, as it may damage the speaker or its internal power amplifier section circuits, may cause more money to get it repaired. OK.

Jan 23, 2012 | NAD M3 Master Series Integrated...

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I have a Sherwood Nottingham R-925RDS receiver. No matter what input I select it does not connect to the amplifier section. Everything else appears to function ok. Unit switches on & off, correct...


Let's work with FM as that is ONboard and can't be connected wrong. Does THAT work?

Turn the volume control to something medium.

The errant switch, control or condition may change and you will suddenly release the amp's full power and possibly destroying your speakers. If a signal isn't audible at 1/2 volume it's probably not there.

Carefully examine the front panel for clues like a misplaced Mute or Tape Monitor control or Multichannel Analog Input selected.

There is a good chance that a common control may have developed a high-resistance or 'dead' spot through idleness and is causing your symptom. Turn the POWER OFF and operate every control throughout its range a number of times, especially rarely-used ones like Tape Monitors and the Mute control.

Turn the volume to something reasonable and see if that helped.

May 06, 2011 | Sherwood Amplifiers & Preamps

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Not a problem probably but my stereo integrated amplifier is playing louder lately with CD, phono and tapes at less volume settings. Why and is this an issue? thanks!


You have absolutely right, the typical audio level output for the tape is 775mVolts and the cd is about 1000mVolts(=1Volt). This is not a problem the audio input that you connect the cd player can handle the difference, but indeed there is an audible difference. I don't know your preamplifier (or integrated amp), but some models have a separate cd input with an input a little bit lower than the tape, tuner, aux e.t.c. Take a look if there is an input like this at your amp. A good idea also is to set the line out volume level at the cd a little bit lower (not available at all cd players), although after the power off -power on the level will come to default. In case you are familiar with soldering tools and connectors I could suggest you a simple schematic for an attenuator. If you desperately need an attenuator like this let me know to make a research for you.

In case of a problem or clarification or further details needed, don't hesitate to post me a reply before rejecting my answer.
If you are satisfied, rate my solution with the "thumbs" or (even better) add a testimonial.

Thanks and regards
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Stelios
direct fixya link: http://www.fixya.com/users/technical114

Feb 08, 2011 | Amplifiers & Preamps

1 Answer

What's the difference between integrated amplifier and power amplifier?


An integrated amp has the Pre-amplifier built in ( Volume and tone controls)
A power amp has no tone controls and no pre-amp section

Aug 30, 2010 | Amplifiers & Preamps

1 Answer

Sherwood AX-4050R Amp - faulty RCA inputs


It is rare for the actual input connectors to fail. More likely, either the solder connections need to be re-flowed, or the switching IC is defective. If you can solder, try resoldering the pins of the RCA connectors. Look closely at them and see if the PC board trace is broken. If the resoldering fails to resolve the problem, look for a switching IC with about 28 pins. It may be marked TC9163 or something similar. That will be the audio switching IC. I would change that next.

Dan

Nov 25, 2009 | Sherwood Amplifiers & Preamps

4 Answers

DENON Input selector jumps randomly


I have a PMA-535R. Same problem but slightly different dialknob. I fixed it by spraying a contactspray and WD-40 into the knob itself. This does mean you have to disassemble the front of the amp and take out print of the dialknob. The knob has a plastic dustcovere that you will have to lift. Good luck

Sep 18, 2008 | Amplifiers & Preamps

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Stereo connection


Hi spanky

Sorry for the delays in getting back to you. Been busy here this week.

OK. to connect the 2275 to the 1152,there are 2 ways of going about this.

You can plug the pre- out of the 2275 to the power amp-in of the 1152. In doing this you are using the power amp section of the 1152 and the preamp functions of the 2275. Your other gear like CD player, tape deck and so on also plug into the 2275.

the other(better) way is to plug the pre-out of the 2275 into the tuner inputs of the 1152, leaving the volume at about 40% on the 2275 and use the 1152 as an integrated amp. This means you are using the 2275 as a tuner only. When you do this, you will need to use an RCA lead to jumper the pre-out/poweramp-in connections on the back of the 1152, and the 2275 ... L to L and R to R respectively.

I am still wondering why you want to use 2 integrated amps (each having a preamp and a poweramp section) The only real benefit the 2275 brings to your system will be tuner functions. You could just get a tuner and run the 1152 to be an ideal rig.

Let me know what your ideal setup you are wishing to build would have. Speakers, other gear like CD, tape deck, etc.

regards
robotek

Jul 23, 2008 | Amplifiers & Preamps

1 Answer

Vintage Stereo Connection ???


Hi spanky

Where to start :) I am excited thinking about them :p You got 2 totally cool pieces of classic vintage gear there in the C2 and the Marantz. I have a C2 preamp myself (gathering dust but wont sell it cos its excellent) and the marantz would be totally cool to have(but then I am a little biased towards 70's vintage marantz). They ruled the roost in HiFi amps throughout that decade.

Because they are both integrated amps, you could use them as standalone systems with a pair of speakers, and just plug your favourite gear into them. If you just wanted to run up a nice sounding HiFi, I would sell the kenwood gear and just keep the Marantz. The Kenwood kr1100 has the edge in power, so if it is grunt you are looking for use that. Because vintage sound is all about stereo, you only really need an integrated amp to get great results.

the specs are
# Kenwood Model Eleven G (KR-11000G) Receiver
120W per channel min RMS, both channels driven, at 8 ohms from 20 to 20.000 Hz with no more than 0.03% total harmonic distortion.
Dynamic power output 440W at 4 ohms
Power bandwidth 5 Hz to 70.000 HZ
Frequency response 5 Hz to 100.000 HZ -1.5dB
Signal to noise ratio 115dB

The marantz is a little lower in power at 75rms a channel, but will have the sonic edge in vintage sound over the kr1100. Look them up on ebay and you will find that they do have some value to collectors and people seeking nice tone. There is an 1152 for sale here for AU$900

Best bet is to fire up the 2 integrated amps,and see how they are going. Run them for several hours to be sure there is no strange noises and crackles. Then decide if you want power or finesse.

You could also run both amps from the C2 preamp by connecting to the Amp in connections to the rear of the integrated amps.

happy to talk to you more about it, hit me with a Fixya if my advice was helpful to you. I would keep the marantz, use that and sell the rest and buy some nice speakers:)

regards
robotek

Jul 20, 2008 | Amplifiers & Preamps

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