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Any Allnic users out there? Hum problem.

I brought this up previously but was not very specific.

I bought an H3000 phono stage which I liked very much and was perfectly silent. I then bought an HA Head Amp which had a slight hum. Shortly after I got it one of the transistors blew(I believe,) it went dead and I had to return it to Korea for repair.

Since I've gotten it back the hum is worse. When I play a record the sound covers the hum but when it stops the hum can be heard and felt from the speakers where I am sitting about 8 feet away. I asked the maker about this and he told me he sent it back to me in perfect condition so that's a dead end.

Is a hum to be expected? Do you live with it? Is it a grounding problem? I asked the maker about this as well and he did not respond to the query.

I would greatly appreciate any advice from Allnic users and especially those with the HA3000. Do you get a hum? Is it noticeable when an lp isn't playing? Any grounding suggestions?

My amp is a VTL S200 with an Ayre pre K5 xe mp.

VTL super scoutmaster with 3D tonearm.

Conditioner is an Isotek Sigma.

As I said everything is perfectly quiet until I turn on the HA.

I want to fix this because I like the Allnic sound enormously and don't want to be without the HA. It really is wonderful.

Thanks for any thoughts you may have on my situation.

vindanpar
vindanpar OP
58 posts
 

Yes it's just the head amp. Mr Park is a talented man and I think his work is excellent I just wish I could get the hum to be not so distracting when the music stops. I wonder if this is a characteristic of the component? I'm wondering if I'm doing something wrong.

I bought the silent as a mouse H3000 through David Beetles and got excellent service from him.




whart's avatar
whart
2,967 posts
 
Try:
Albert Porter
Post over on WBF and call out for Carl- his handle over there is "cjfrbw" (Perhaps he posts here too).
Christian/Rockitman, who I'm pretty sure has the head amp.

ps68
228 posts
 
I am using H3000 but again, not HA. It sounds like a ground loop issue between the two stages but Mr Park I am sure would have allowed for this in the circuitry, perhaps using a diode.

H3000 is a really wonderful amplifier, and very quiet..

Rgds,
Paul
pops
2,272 posts
 
Same here, I have had the H3000 for several years without the head amp and have encountered no problems.  It is dead quite and has been very reliable.

It sure sounds like a ground loop issue.  That can be tough to find and cure.  Good Luck.

lewm
12,458 posts
 
I have long wondered about the philosophy behind marketing the HA3000 as an add-on to the H3000.  The latter unit is revered for its very high quality built-in amorphous core SUTs that also offer quite a bit of adjustability.   Why create the idea that a "head amplifier" is a viable alternative to using those SUTs?  Anyway, it is odd that the OP has a hum problem. I would consult the US or Canadian importer(s).  They're both very good and responsible.
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