TEAC A-H500i

[Theprince_62]

Hi
i got an A-H500i and i have a little problem,
when i use the selector to change CD - MD -TAPE - PHONO - TUNER - AUX it happens that i hear a (click) from a position to the other. I use the headphone and the (click) does not depends from the volume, so even at zero.
Same happens to the Source - Off - Tape - Md
What do you think? How could resolve it?
Thx

 

[TLS Guy]

Hi
i got an A-H500i and i have a little problem,
when i use the selector to change CD - MD -TAPE - PHONO - TUNER - AUX it happens that i hear a (click) from a position to the other. I use the headphone and the (click) does not depends from the volume, so even at zero.
Same happens to the Source - Off - Tape - Md
What do you think? How could resolve it?
Thx

You can't. That is an old analog amp. What you describe is common with that type of analog switching. We are now used to digital switching which is generally silent.

 

[MrBoat]

Switch the position before powering on.

 

[Theprince_62]

You can't. That is an old analog amp. What you describe is common with that type of analog switching. We are now used to digital switching which is generally silent.

Hi,
maybe you did not ever see one of it, to talk in this way. It switchs by Anam (IC72) by the RC. This amp is old? You really make laugh ...... do you know that it uses the Artificial Intelligence to control all the system (500 series)?.... Do you know it uses military quality components? Come on, i think you should buy one and listen to it. More, i have more than 15.000 hours of music listening in my life, i was a Dj Radio for years.... ears are important to judge an ampl or a music system.

 

[isolar8001]

Oh, you are going to be popular.
First review of that amp was from 1997....its old.

 

[Theprince_62]

Oh, you are going to be popular.
First review of that amp was from 1997....its old.

Also our Ferrari BB was on 1980 .... it is old, sure, but i do not think you could be in it's back by your plastic car... come on.... and... the A-H500(i) is on 2003 not on 1997. You are a champion !!!

 

[everettT]

Hi,
maybe you did not ever see one of it, to talk in this way. It switchs by Anam (IC72) by the RC. This amp is old? You really make laugh ...... do you know that it uses the Artificial Intelligence to control all the system (500 series)?.... Do you know it uses military quality components? Come on, i think you should buy one and listen to it. More, i have more than 15.000 hours of music listening in my life, i was a Dj Radio for years.... ears are important to judge an ampl or a music system.

Considering that he has being repairing reel to reel, tape players, amps, preamps, etc and building speakers longer then you've been alive, he usually knows his stuff. When someone says it's old, it's not a knock just that it is old. The amps.he uses to power his system are old, but good. When was the last minidisc that you played and wasn't this introduced 23+ years ago? Regardless of what you think, his comments weren't negative and likely correct.

 

[isolar8001]

Also our Ferrari BB was on 1980 .... it is old, sure, but i do not think you could be in it's back by your plastic car... come on.... and... the A-H500(i) is on 2003 not on 1997. You are a champion !!!

Car comparisons now?
I have a 1988 Saab 900 Turbo Convertible....so shut the hell up.
You are a special kind of idiot.
Like evererttT just said, you have no clue who you are dealing with being catty with TLSGuy.

It appeared in the 1999 edition of the Audio equipment guide (p 76).
HifiEngine lists it as a 1997 unit...production ended in 2003.

TEAC A-H500 Integrated Stereo Amplifier Manual | HiFi Engine

www.hifiengine.com

 

[Eppie]

I checked out some YouTube videos and one included the schematic. As far as I can tell, the input selector is not a mechanical switch. Looks like a hall effect sensor so as you rotate the knob the input changes electronically. That's why you can change inputs on the remote as well. Despite that, I don't think that there is anything that can be done about the clicking. If the clicking is the same level regardless of volume, then something after the volume circuitry is picking up the switching noise. There is only one way to diagnose this. You need a signal tracer and an oscilloscope to trace the source of the clicking backwards from the headphone amp section. If the source happens to be the ICs that control the inputs, then it's inherent in the design. You could take it to a shop with a good repair tech, but I think you'll end up spending money just to have them tell you that it can not be remedied.

 

[Theprince_62]

I checked out some YouTube videos and one included the schematic. As far as I can tell, the input selector is not a mechanical switch. Looks like a hall effect sensor so as you rotate the knob the input changes electronically. That's why you can change inputs on the remote as well. Despite that, I don't think that there is anything that can be done about the clicking. If the clicking is the same level regardless of volume, then something after the volume circuitry is picking up the switching noise. There is only one way to diagnose this. You need a signal tracer and an oscilloscope to trace the source of the clicking backwards from the headphone amp section. If the source happens to be the ICs that control the inputs, then it's inherent in the design. You could take it to a shop with a good repair tech, but I think you'll end up spending money just to have them tell you that it can not be remedied.

thx for answer

 

[isolar8001]

Yep...beyond dumb and reported.
Must be the side effects of being a "DJ Radio"

 

[Theprince_62]

Yep...beyond dumb and reported.
Must be the side effects of being a "DJ Radio"

you really make me laugh..... try to listen to over 15.000 hours of music, try to study
nuclear physics, try to study electronic engineering.... then, maybe, you are allowed to talk with me.

 

[TLS Guy]

Hi,
maybe you did not ever see one of it, to talk in this way. It switchs by Anam (IC72) by the RC. This amp is old? You really make laugh ...... do you know that it uses the Artificial Intelligence to control all the system (500 series)?.... Do you know it uses military quality components? Come on, i think you should buy one and listen to it. More, i have more than 15.000 hours of music listening in my life, i was a Dj Radio for years.... ears are important to judge an ampl or a music system.

It is analog switching, but uses ICs, presumably packed with flip/flop solid state switches, most likely tailed Darlington pairs that can be destabilized. This is so it can be controlled with a remote, unlike mechanical analog switches.

Here is the schematic.

I have to say this design is packed full of gratuitous complications, and the sort of device I would have run in the opposite direction from. So I would have no interest in owning a unit like that. So what you are experiencing is inherent in the design, especially as the small caps which are part of those ICs age. I highly doubt the unit is serviceable and would bet the ICs are NLA, as usually there were only one run of those types of chips.

I am not opposed to vintage gear and have a huge collection of vintage gear and use it, along with state of the art digital gear. But I have leaned what to stay away from, and your unit would be one such. In general gear of that era, which bridged the analog to digital transition, tends to be problematic. If you want vintage gear you are actually better off going older. My vintage preamps are from 1966 to mid eighties. All my power amps are seventies to early nineties. Most of it Quad, manufactured by Quad Electroacoustics of Huntingdon Cambridgeshire UK. I have had little appetite for Far Eastern gear.

 

[TLS Guy]

you really make me laugh..... try to listen to over 15.000 hours of music, try to study
nuclear physics, try to study electronic engineering.... then, maybe, you are allowed to talk with me.

Buy the way you present yourself I suspect you know nout about those topics lad. So far you have barged in, insulting long term members who have done a lot of heavy lifting over the years, and made a right "Pillock" of yourself.

 

[isolar8001]

you really make me laugh..... try to listen to over 15.000 hours of music, try to study
nuclear physics, try to study electronic engineering.... then, maybe, you are allowed to talk with me.

I had the mods remove the downright vulgar message this was a reply to....pretty sad that on you 6th or so post here you resorted to gutter level insults.
Maybe instead of studying nuclear physics and electronic engineering (yeah, right) you should take some courses in anger management and social interaction.
Probably will be more constructive for you than entering that 16th hour of music listening.

 

[Theprince_62]

I had the mods remove the downright vulgar message this was a reply to....pretty sad that on you 6th or so post here you resorted to gutter level insults.
Maybe instead of studying nuclear physics and electronic engineering (yeah, right) you should take some courses in anger management and social interaction.
Probably will be more constructive for you than entering that 16th hour of music listening.

You bark like a dog, you are ignorant

 

[Theprince_62]

Buy the way you present yourself I suspect you know nout about those topics lad. So far you have barged in, insulting long term members who have done a lot of heavy lifting over the years, and made a right "Pillock" of yourself.

You bark like a dog, you are ignorant

 

[everettT]

You bark like a dog, you are ignorant

You bark like a dog, you are ignorant

You came back to argue with people that were only trying to help you, smh.

 

[isolar8001]

You bark like a dog, you are ignorant

Oh Yeah?? , at least I'm not a damn TEAC lover !!!!

Must be a boring day in the nuclear physics lab.
You should be splitting atoms, not hairs.

 

[TLS Guy]

You bark like a dog, you are ignorant

You sound like a bloke only operating on a couple of neurons and half a synapse!