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Intermittent slight Hiss FET-9 Preamp
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Old 2nd December 2019, 05:26 PM   #11
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Intermittent slight Hiss FET-9 Preamp
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Old 2nd December 2019, 06:38 PM   #12
coolnose is offline coolnose  Europe
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Just buy some Kester 44 with either reference, find a small spool if it's a 1 time job.

Don't upset ZM with esoteric solder, even the 2% silver stuff moves him in some way

Sn62Pb36Ag02 44 0.020 0.50 66 3.3% Leaded Contains Halogen Sn62Pb36Ag02 3.3%/44 .020 1 LB SPL 2471500010 Rosin
Sn62Pb36Ag02 44 0.025 0.60 66 3.3% Leaded Contains Halogen Sn62Pb36Ag02 3.3%/44 .025 1 LB SPL 2471500018 Rosin
Sn62Pb36Ag02 44 0.031 0.80 66 3.3% Leaded Contains Halogen Sn62Pb36Ag02 3.3%/44 .031 1 LB SPL 2471500027 Rosin

I would go go with either 0.025 or 0.031 .... the last numbers starting with "2471" are the manufacturer part numbers, try your preferred seller.

Last edited by coolnose; 2nd December 2019 at 06:39 PM. Reason: EDIT: If I had to chose 1 size only, make that 0.025
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Old 2nd December 2019, 06:51 PM   #13
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I was trying to figure-out what was up with the "Devil" face

So, esoteric solders are the Mighty Zen-Mod's "Kryptonite"?
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Old 2nd December 2019, 06:57 PM   #14
coolnose is offline coolnose  Europe
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Ask him.... I couldn't tell...

EDIT: All "esoteric" is Kryptonite to ZM... besides 1uF MKT maybe

Last edited by coolnose; 2nd December 2019 at 07:01 PM. Reason: EDIT
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Old 2nd December 2019, 07:01 PM   #15
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nope

it was for Cardas being just slightly snake-oilers

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Old 3rd December 2019, 01:57 PM   #16
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Got a chance to do a little more listening, but not enough time to touch-up any solder joints (maybe tonight - got some old-school Kester 44 core solder from one of the techs at work who had a roll stashed, and I snagged a few feet of the stuff).

The "hiss" is intermittent (it comes and goes) - when it occurs it sounds similar to a ceramic plate rattling gently on a glass shelf.

The "hiss" occurs in the Left Channel.
It also occurs via BOTH the "CD Player" and "Video" Inputs - so I suspect that it IS NOT a bad / iffy selector switch or a position on a selector switch.
This seems to point to something in the Rear portion of one of the PCBAs and/or "V+" Section of the Power Supply.
I checked the "V+ REG" & "V- REG" for DC Voltage (set to 17 VDC +/- 0.01 by my Fluke 77). Also checked for AC Volts and got NADA.
(But those readings were with NO source signal going through it.)

Last edited by Geeqner; 3rd December 2019 at 02:03 PM.
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Old 3rd December 2019, 06:28 PM   #17
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Intermittent slight Hiss FET-9 Preamp
time for soldering and wigglewiggle
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Old 5th December 2019, 04:48 AM   #18
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Removed Cover and Poked-around with Bamboo Poker & Flashlight with CD running. Did not find anything, but one Banana Plug setscrew was loose on Left Speaker wire, so maybe that had been there for a while and didn’t notice. If the hiss is still there, it’s BARELY noticeable.

Connected Turntable (Teledyne/AR “The Turntable”, Straight Gelco Tonearm, & Shure V15-VMR. Played a side of “Mask” by Kansas & “Eye in the Sky” by Alan Parsons Project. Wifey thought that I had hauled out some Old CDs... Sounded TERRIFIC. I was hearing stuff/ instruments / sounds that I do not recall hearing on these before (in a GOOD way).

This thing certainly has THE BEST phono section that I’ve ever had connected to MY System.
-Huge step UP from late 1970s Zenith receiver
-Way better than “classic” NAD receiver that I had been using as a Pre-Amp

Makes me want to find a classic Stasis Series or PL Power Amp as an upgrade for my relatively new Emotiva XPA-2 (which is pretty decent, but probably NOT up to the standards set by Mr. Pass).

Time to think about building an Upgraded Power Supply for the FET-9.
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Old 5th December 2019, 08:31 AM   #19
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Intermittent slight Hiss FET-9 Preamp
where this world is going ......... when spending money on booze and dope isn't main thing anymore

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Old 5th December 2019, 03:30 PM   #20
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Never got into the Dope part (although there WAS that time when I built a stick-model airplane in my college dorm room and got higher than the bejeezus when I "doped" the wings - SPLIT-TING Headache the next day...)

Some "Action-Pics":
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