Technics SU-VZ320 amp

[willawake]

amp is over 10 years old. volume control is weird - one speaker is louder than the other and some crackling on that speaker before a decently loud volume is selected. sometimes that one speaker is going quiet occasionally.

what kind of servicing should i do? renew the solder joints i guess, should i remove each solder and put new or do i just heat and add solder. any ideas? what about the caps should i look into renewing them? what else?

its kinda sentimental value. lots of music went through that thing....

[kc8adu]

Re: Technics SU-VZ320 amp

clean all the pots with deoxit.
check and touch up solder joints.check/adust bias/offset.

[willawake]

Re: Technics SU-VZ320 amp

thanks kc8, can you come again on how i do that :

check/adust bias/offset.

[willawake]

Re: Technics SU-VZ320 amp

its with the opamps right? i have to adjust the pots? i will get a pic to figure this out.

[Rainbow]

Re: Technics SU-VZ320 amp

I'd look at the volume pot. It probably requires cleaning or replacement.

[Per Hansson]

Re: Technics SU-VZ320 amp

I'd look at the volume pot. It probably requires cleaning or replacement.

I had a really old amp with a bad volume control, the sound would crackle, but if i "massaged" the volume knob for a min it would be fine for an hour...

Electronic spray also helped, but only for a short while; I found a good fix though, I bought a new receiver :P

This one has Toslink which I kinda needed also so it was not only for the bad volume knob I retired the old one

[willawake]

Re: Technics SU-VZ320 amp

here's some pics. threads are boring without pics







so i will try to find a replacement pot on monday and i am renewing the soldering today.

[linuxguru]

Re: Technics SU-VZ320 amp

The layout is lean, mean and clean - even by Matsushita's usually superb standards. My only quibble is that I dislike integrated power-amp modules - I prefer discrete bipolar O/P stages any day. This just can't be modded meaningfully at all.

On another note, this Panasonic bookshelf-audio system produces stunning sound - even better than $10k high-end separates from ~10 years ago (just ignore the PMPO crap):

http://www.jbronline.com/storefront/...ProductId=3266

Entry-level level audio standards have gone up considerably in 10 years.

[Oklahoma Wolf]

Re: Technics SU-VZ320 amp

As others have recommended, clean the volume pot

I was just given an old JVC RX-315 receiver about the same age, and am wishing its problems were as easy as a dirty pot. It won't switch inputs anymore. One channel was dead too, but resoldering everything fixed that problem. Actually not sure I'll even bother with it - I have no use for the thing.

[willawake]

Re: Technics SU-VZ320 amp

i couldnt find a 100kohm pot, they only had a 50. anyway i got some philips degreaser cleaner. its extrememly flammable which i guess is a good sign.. i opened the pot and then sprayed it and worked the pot. the crackling is gone but there is a point where one speaker goes off and the pot clicks at that point i believe. anyway no biggie. i resoldered the secondary board. i will do the rest this long greek easter holiday (4 day weekend yeah! )

is a 50 ohm pot going to be too insensitive?

i will get a new amp sometime when i finally choose one. i am listening to mp3s most of the time via the audiophile 192 to b&w 302s so i probably dont need anything really expensive. i always had my eye on an arcam. the nad i heard to be good also.

check this one http://www.avihifi.co.uk/IntAmp/Integrated%20Amp.html
alas very expensive.

[willawake]

Re: Technics SU-VZ320 amp

......linuxguru got me checking out amps again. in the around 1000 euro category we have

Roksan Kandy Integrated Amplifier MkIII 115w



Rotel RA-1070 100w



http://www.tnt-audio.com/ampli/rotel1070_e.html

[kc8adu]

Re: Technics SU-VZ320 amp

nahhhhh find an old sansui g-33000
havnt found anything new that can touch mine.
i use a fisher 400 on this pc.yes its full of tubes.
heres a pic of a g-33000

[willawake]

Re: Technics SU-VZ320 amp

its a vintage monster receiver

[Chris1992]

Re: Technics SU-VZ320 amp

really classy too. I want a G-5700.

[willawake]

Re: Technics SU-VZ320 amp



there is much hype about NAD on the boards - nad c372

[mbates14]

Re: Technics SU-VZ320 amp

just watch out for that output IC. them things are a bitch. WAY expensive to replace. I know from experiance, i lost one IC from a technics SV-GU90 or something like that. I cant remember now.