Maybe, I can help you like it even more...

Posted by Interstage Tranny (A) on September 18, 2010 at 13:45:05

In Reply to: I'm using a chrome phono stage posted by HI FI BOB on September 18, 2010 at 07:00:00:

If yours is the unit Henry got more than a few years ago at the Kutztown event, then maybe it's time for some mo' better upgrades.

First, concerning hum, hummmmm should not exist, at all. These units do use parts that are not new. Some of these have the underneath augmented power supply caps added, in parallel, with the stock, original stand-up electrolytic mounted atop the chassis. That original electro is now 50 years old. It lasted this long because the unit only draws about 4 mA of DC voltage. I know Henry uses a Variac for his tube gear, keeping AC voltage from the wall at a safe level going into the tube gear; around 110-115 VAC. If you don't use a Variac, you are increasing all the working voltages and running this unit hot. Furthermore, if you run vintage tube gear originally designed for 115-117 VAC in, without lowering the 120-125 VAC in, that is available at your AC wall sockets, then you are abusing the tubes and many parts, including the power supply caps.

So, check which cap or cap section is leaking AC, by isolating the caps or electro sections, so you or Henry can replace the leaky hum causing power supply cap or caps. Then, please resume thorough enjoyment by making sure the unit is seeing 115-117VAC maximum. 110-115 VAC will work fine, by the way.

Now, if Henry bought your particular chrome unit, way back when, the phono EQ network choice and parts values have evolved since then. Also, many of these units are out there, rewired for allowing two tables to be switched at the chrome unit; a nice feature. But, first thing is first. Let's make sure the power supply is hum free and you feed the unit 117VAC or less. In 1965-1970, AC wall voltages were 115-117. Today, we are looking at 120-125 VAC available at the wall, depending on your locale and time of day. If we feed in 120-125VAC, filament voltage increases, high voltage increases, parts get abused and the parts and tubes' useful lives get shortened. Henry has my contact info and I will be glad to help you sort this stuff easily...It's all about the enjoyment factor and I want a high enjoyment factor...

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Follow Ups Full Thread

Topic - Advent 300 for phono stage - catama 09:13:57 09/15/10 (17)

RE: Advent 300 for phono stage - TedR 15:15:58 09/18/10 (1)

RE: Advent 300 for phono stage - Brian Levy 12:25:22 09/19/10 (0)

It's a super little receiver - 4season 11:06:58 09/16/10 (3)

RE: It's a super little receiver - catama 17:12:22 09/16/10 (2)

Thanks but no thanks - 4season 22:06:47 09/16/10 (1)

RE: Thanks but no thanks - Brian Levy 07:31:46 09/17/10 (0)

RE: Advent 300 for phono stage - BigguyinATL 13:43:20 09/15/10 (0)

RE: Advent 300 for phono stage - Marantzguy 12:55:22 09/15/10 (9)

Did You Upgrade the Phono EQ for the Highs in the M65 ? - Interstage Tranny 15:28:18 09/15/10 (8)

RE: Did You Upgrade the Phono EQ for the Highs in the M65 ? - Marantzguy 17:11:19 09/15/10 (5)

the Shure M65 vs. chrome phono preamps... - Interstage Tranny 17:48:48 09/15/10 (4)

I'm using a chrome phono stage - HI FI BOB 07:00:00 09/18/10 (2)

Maybe, I can help you like it even more... - Interstage Tranny 09/18/1013:45:05 09/18/10 (1)

RE: Maybe, I can help you like it even more... - HI FI BOB 10:55:03 09/19/10 (0)

RE: the Shure M65 vs. chrome phono preamps... - Marantzguy 10:24:32 09/16/10 (0)

RE: Did You Upgrade the Phono EQ for the Highs in the M65 ? - catama 15:35:59 09/15/10 (1)

It's All About The ENJOYMENT Factor..... - Interstage Tranny 17:05:00 09/15/10 (0)

Follow Ups

Maybe, I can help you like it even more... - Interstage Tranny 09/18/1013:45:05 09/18/10 (1)

RE: Maybe, I can help you like it even more... - HI FI BOB 10:55:03 09/19/10 (0)

Maybe, I can help you like it even more...

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