CurtPalme.com Home Theater Forum

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Ok Cleaned up the contacts in the head shell and then the Phono inputs. A little better. I know the thing needs recapping the four large 1200uf 90vdc caps show between 700 and 950 uf. I will also clean all ground contacts. these old units don't have a ground plug on the AC cord. Would adding one and attaching it to ground on the chassis help at all or is it best to leave it alone?

But Dexter sounds great right now, those old Acoustic research speakers with the new Soft dome tweeters I added sound great.
I will need to do the woofer surounds soon, the originals are looking like they are about to go.

The hum might only be on the phono section, will test more when I have time.

Athanasios

**Curt Palme** · Posted: Tue Nov 23, 2010 5:12 am Post subject:

You can use the pencil test on the surrounds. Place the speakers face up, and hold a pencil, point down, about 6" up between your fingers. Let the pencil tip drop via gravity only. If the tip bounces off, the foam is fine. If it does through, they are toast. Smile

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Hi Curt, the 2 large caps on each board are the 1200uf 90vdc ones that show low uf values . Are these the ones that could be causing the Hum?

You can see the after and before of the dirt on the boards here.

I plan to re cap both Boards. with the large caps there is nothing even close in Size. So I think
I will just put a larger value, maybe double the uf's and 100VDC since there are no 90 VDC in that size.

I still need to clean all grounds as the hum did go away when I touched the center pin of the Turn table
RCA to the chassis. And if I touch any part of the Turn table metal or the receiver metal the slight hum at high volume goes away completely. So it might be a ground issue more than the Caps.

But this is a really nice sounding unit and i forgot how nice the AR-2 sound after I redid the cross over and new tweeters.I did that over 15 years ago, that was my short lived experience with electronics till I got my First Marquee.

Temp set up.

I'm now on the hunt for a Tube Receiver, just missed out on a Fisher 500 C by 10 bucks, went for 385.

Got my eyes on a H.H Scott 399

Athanasios

**AnalogRocks** · Posted: Thu Nov 25, 2010 5:10 am Post subject:

You are sooo addicted Thumbs Up

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

**AnalogRocks** · Posted: Thu Nov 25, 2010 7:59 am Post subject:

No it was through osmosis. Just by being in the same room you suddenly feel like getting some old analog equipment. Mr. Green

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

I still feel the static in the air Very Happy

Nashou

**Curt Palme** · Posted: Thu Nov 25, 2010 3:22 pm Post subject:

Nash, it could be any of the caps. THe older caps don't leak like the newer cheapies do, so you need a capacitor checker or just replace all of them. THe unit is worth more with it all recapped anyways.

Or get one of these if you're doing this often enough to justify it. Mine paid for itself within a month:

http://cgi.ebay.com/In-Circuit-Capacitor-ESR-Meter-Digital-ESR-Tester-/270668866992?pt=LH_DefaultDomain_2&hash=item3f051f25b0

I paid $200 for a slightly fancier one, but this one will work as well.

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Curt how about this one?

http://cgi.ebay.com/TONGHUI-HANDHELD-DIGITAL-LCR-LCZ-LCRZ-METER-TH2821B-/350411263190?pt=LH_DefaultDomain_0&hash=item5196238cd6#ht_2676wt_1139

Doesnt say ESR directly but isn't and LCRZ meter the same?

Ok Just googled and found ESR is the same as Impedance . Looks like the meter above is
the one I should get as I do want a better L meter as well.

Athanasios

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Didn't get the HH Scott 399 receiver bit I just got a 299 C Integrated amp.

Athanasios