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Crack / Should L/R RCA center pins have the same resistance?

« Last post by saunaboi17 on Today at 06:55:16 PM »

My left center pin reads: 96.6k ohms and my right center pin reads: 105.2k ohms.
These are both within range, but I'm worried these differences will affect the L/R balance.
All my other resistance checks passed and I'm about to move to voltage checks.

Thank you,
Norman

Reduction / Re: Lots of DC voltage readings off vs. manual

« Last post by Paul Birkeland on Today at 06:41:50 PM »

Quote from: cpditter on Today at 02:16:29 PM

3: 152v

Nothing connects here in the build, and nothing connects here in your build. Are you sure that wasn't terminal 4?

Quote from: cpditter on Today at 02:16:29 PM

6: 5.1v

How's terminal 5? I would suspect that the black wire that grounds terminal 5 isn't well connected/soldered on one end. Either that or the 1M resistor isn't well connected/soldered (though it looks OK from the photos). This is a big problem though, this will throw things off on that side of the kit.

Quote from: cpditter on Today at 02:16:29 PM

18: 151v
19: 150v
20: 150v
26: 150v

You have a miswire on your B socket. The center post is floating.

Quote from: cpditter on Today at 02:16:29 PM

28: 90-115v
30: 150v

These are also terminals that connect to nothing. Maybe you're seeing 90mV here, which would be 0.090V. If that's the case, maybe that's what's going on with terminal 6?

Quote from: cpditter on Today at 02:16:29 PM

44: 74v
45: 70v

You can ignore these. There's AC voltage here that may throw off your meter.

Quote from: cpditter on Today at 02:16:29 PM

47: 177v

This is only 3V off. It may actually drop a little more when you get the B socket wiring error sorted out.

Stereomour II / Re: convert Stereomour to a preamp.

« Last post by Paul Birkeland on Today at 06:31:45 PM »

You would need to add something like a mosfet follower to bump up the drive current and lower the output impedance. Without the step-down of the output transformer, gain would be a lot higher than it would be from the speaker taps.

Eros Phono / Re: When should I have soldered the 2 drain wires at the Center terminal of D?

« Last post by Paul Birkeland on Today at 06:30:52 PM »

What are the Kreg voltages?

Eros Phono / Re: When should I have soldered the 2 drain wires at the Center terminal of D?

« Last post by PaulG on Today at 06:16:28 PM »

I got all 4 of the diodes to light up when I put in the tube and powered up the unit to test shunt regulator voltage.
The red wire from D1 tested a very solid 223.1 with all 4 diodes lit.
The red wire from D6 tested a wavering 110 VDC The 2 diodes on the B side of the Shunt regulator board lit right away with the ones on the A side lagging about 15 or 25 seconds behind.

I repeated both tests because I hadn't checked the Tube heaters.
D1 was exactly as before 223 VDC and I could see the Tube heaters lit.
D6 tested differently with an immediate surge to 330 VDC and then settled to a solid 139 VDC. The tube heaters were lit.

I'm going to reread every thread having to do with Shunt Regulators but I would appreciate any thoughts.

Stereomour II / Re: convert Stereomour to a preamp.

« Last post by 2wo on Today at 04:49:04 PM »

How about pulling out the 2A3 and tapping an output from pin 3 (grid)? The first stage is set to deliver a lot of voltage gain but with a low enough input or pad, it might work. Let Paul comment before you try in but I suspect your hum is from the output stage...John

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