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80's Technics Integrated Amps

SVI2004A said:
:yikes: don't run it like that!!!!!!

Needs to be on a level surface right way up.... You will render the liquid refrigerant filled heatsink useless
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Ok, thanks for the advice! :thmbsp:

Temporarily fixed:

20141108_173555.jpg
 
That'll be fine for the now... When you hook speakers up, make sure it's on a surface that will let it breathe, the carpet won't do that.

Which country you in?
 
Anyway it's awesome as a heaphone amp imho, just the bass response and the very low bass distortion makes it outstanding, midrange is top class with lots of crunch in guitars and clear vocals without S-artifacts, treble is slightly less amazing, it is somewhat compact with less air than the best and maybe some grain but it sound musical nevertheless - if not totally natural. Stereo image is pin-pointed and there is depth and height. Overall, a very solid performance, where the punch in the lower registers really stands out.

Obviously Technics knew what they where doing, however I believe this is a amplifier that has a "sound", it is not an amplifier of the totally neutral variety, but it is a very satisfying sound and I like it a lot. As well as I like vintage Sansui- and JBL-sound :-)

I wonder how it does with loudspeakers ...
 
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Over the last 20 years I have collected a SU-v5, SU-v9 and both have developed issues with a channel cutting out
My latest acquisition (last year) is a SU-v505 and the dreaded channel cut out is starting on this unit too. :sigh:

Really love these amps to bits, but it seems hard to get a 100% working one nowadays.

Anyone else had this problem with theirs ??
 
Had to replace a few protect relays over the years... A big cause in your units is dirty input select switches.
 
daz_mawdsley said:
Over the last 20 years I have collected a SU-v5, SU-v9 and both have developed issues with a channel cutting out
My latest acquisition (last year) is a SU-v505 and the dreaded channel cut out is starting on this unit too. :sigh:

Really love these amps to bits, but it seems hard to get a 100% working one nowadays.

Anyone else had this problem with theirs ??
Click to expand...

The sample of the V4X I talk about here actually had similar problems already when it was new back in the eighties, but in this case I think it had something with the protection circuit to do. It never came out of protection at about 3-4 years of age.

Luckily I knew a radio serviceman who replaced some component I don't remember which for the owner back then, after that it has been working for some 25+ years and obviously still is.

Less than perfect quality control, and some components on the cheap maybe? Anyway, old amplifiers of ANY brand usually develops problems ...
 
Spot on!

They are the switches indeed. They ran them via steel controller cables to minimise interference to the signal path
 
SVI2004A said:
Had to replace a few protect relays over the years... A big cause in your units is dirty input select switches.
Click to expand...

Yes, relays can fault, and dirt and oxide affects any old amp. A thorough cleaning can do wonders, but it doesn't make switches and pots new as the cleaning also removes some of the original protective layer which makes the need for cleaning more frequent over time ...
 
xeizo said:
The sample of the V4X I talk about here actually had similar problems already when it was new back in the eighties, but in this case I think it had something with the protection circuit to do. It never came out of protection at about 3-4 years of age.

Luckily I knew a radio serviceman who replaced some component I don't remember which for the owner back then, after that it has been working for some 25+ years and obviously still is.

Less than perfect quality control, and some components on the cheap maybe? Anyway, old amplifiers of ANY brand usually develops problems ...
Click to expand...

Most likely dry joints or replaced pre drive transistors (Q501~504)
 
xeizo said:
Yes, relays can fault, and dirt and oxide affects any old amp. A thorough cleaning can do wonders, but it doesn't make switches and pots new as the cleaning also removes some of the original protective layer which makes the need for cleaning more frequent over time ...
Click to expand...

Those particular types V8 V9 ~ V909 can really get bad over the decades... Like some heavy duty tarnishing happens

Cleaning is the only option, as they're long time unobtanium
 
SVI2004A said:
Those particular types V8 V9 ~ V909 can really get bad over the decades... Like some heavy duty tarnishing happens

Cleaning is the only option, as they're long time unobtanium
Click to expand...

I recently picked up a Technics SU-V98 that appeared clean, powered on, and sounded clean. At home it seems to work but is limited in volume. The volume knob rotates around and around with no increase in volume beyond what is a a conversational level. Is there some sort of protective circuitry that governs the volume so it will not overdrive the speakers?

It is not a bad little amp, perfect for a small room. It gets plenty loud but this "feature" of a volume knob that has no stops and goes round and round with no increase in volume beyond a certain point is curious. I don't have a user manual and the online service manual does not explain this. What is this?
 
Technics su-7700II

I got Technics su-7700II few weeks back, not sure where it stands and what are the sound characters, I picked this unit against SU-7, not sure whether I made correct decision??
 

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brucegseidne said:
I recently picked up a Technics SU-V98 that appeared clean, powered on, and sounded clean. At home it seems to work but is limited in volume. The volume knob rotates around and around with no increase in volume beyond what is a a conversational level. Is there some sort of protective circuitry that governs the volume so it will not overdrive the speakers?

It is not a bad little amp, perfect for a small room. It gets plenty loud but this "feature" of a volume knob that has no stops and goes round and round with no increase in volume beyond a certain point is curious. I don't have a user manual and the online service manual does not explain this. What is this?
Click to expand...

I also picked up a SU-V98 from CL, some years ago. Volume was never an issue at 120 WPC. You may indeed have the muting on or a defective potentiometer.

I found the amp to really rock, belt out much bass, but had little finesse in the upper registers. It made a great sub-woofer amp.
 
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