Dual-500 king of the Castle

[WOPL Sniffer]

How does he get anything done if he always has a phone stuck to his ear???

HUH?

 

[J!m]

I used to joke with my (South African) co-worker…

He would put his phone under his ear muff and keep working.

The joke was: “African noise cancelling hands-free cell phone”.

It worked!

 

[e30m3mon]

Seems we all have phone conversations with him, indeed, great guy to talk with..

Add me to that 'saw phone circle!
We've been working on my D500 project, or more correctly, HE's been educating me on all his knowledge gained from years of rebuilding these rare beasts. "Drinking from a fire hose" would be the correct analogy!

 

[NeverSatisfied]

Add me to that 'saw phone circle!
We've been working on my D500 project, or more correctly, HE's been educating me on all his knowledge gained from years of rebuilding these rare beasts. "Drinking from a fire hose" would be the correct analogy!

Glen is very generous with his time and knowledge, he just helped me finish a little project. He sent me some parts to upgrade the D500 and was concerned that I didn’t have a way to safely discharge those monster capacitors, so he sent some parts and walked me through building a discharge box. It worked perfectly but after seeing a picture of his DBT, Capacitor discharge combo, I felt like I needed to up my game.

 

[laatsch55]

Glen is very generous with his time and knowledge, he just helped me finish a little project. He sent me some parts to upgrade the D500 and was concerned that I didn’t have a way to safely discharge those monster capacitors, so he sent some parts and walked me through building a discharge box. It worked perfectly but after seeing a picture of his DBT, Capacitor discharge combo, I felt like I needed to up my game. View attachment 66445View attachment 66446View attachment 66447

And up your game you did..

 

[grapplesaw]

And up your game you did..

When I see the red button the Men in Black rushes to my mind

“Don’t press the red button”

 

[wattsabundant]

Spencer showed me this test set when I was in Houston. I suggested adding a bridge rectifier on the meter so that it will only read a positive voltage regardless of how it is connected.

 

[J!m]

But wouldn't there be a drop across the rectifier? Mess up that precisional cabliration n shit.

 

[grapplesaw]

But wouldn't there be a drop across the rectifier? Mess up that precisional cabliration n shit.

I was thinking the same thing so I found this


“If we look at the basics, a bridge rectifier converts pure ac to pulsating dc with the use of 4 diodes or SCR's . That means a pair of diodes will act as a short circuit path to the negative half of the cycle and will allow us to obtain or draw the negative half as output.
Now , if we shift to dc, we shall give utmost consideration to that fact that pure dc is neither pulsating nor sinusoidal. So whatever input we apply, with whatever polarity that fancies us, our output will be just the same as input (some voltage drop is definitely there due to diodes or SCR's ).”

 

[wattsabundant]

But wouldn't there be a drop across the rectifier? Mess up that precisional cabliration n shit.

Yes, there will be 2 diode drops =1.2 volts. I don't think accuracy is critical in this application. The intent of the meter is to know when the caps are discharged. A couple volts doesn't matter.

 

[NeverSatisfied]

Yes, there will be 2 diode drops =1.2 volts. I don't think accuracy is critical in this application. The intent of the meter is to know when the caps are discharged. A couple volts doesn't matter.

This is definitely on my list to get done. You guys are always teaching me something new and bit by bit I am getting a great education. I am eternally grateful.

 

[grapplesaw]

This is definitely on my list to get done. You guys are always teaching me something new and bit by bit I am getting a great education. I am eternally grateful.

See you are ready to try a rebuild on your own . Just listen to yourself. lol

 

[NeverSatisfied]

See you are ready to try a rebuild on your own . Just listen to yourself. lol

I appreciate your confidence in me but I am not sure I am ready just yet….

 

[grapplesaw]

I appreciate your confidence in me but I am not sure I am ready just yet….

Ok no rush

 

[J!m]

I learn best “the hard way” so I say go for it.

Look at that phono pre I built. Never stuffed a board prior as that thing smokes a LOT of high dollar preamps.

Good news: it may be available commercially soon.

Bad news: it won’t be from my company.

The designer (Wyn Palmer) was approached and has been working on prototypes for a “well known” company, which has not been disclosed yet.

It was directly compared to a $10,000 Pass Labs phono pre and preferred by a wide margin.

 

[mlucitt]

Good news: it may be available commercially soon.

Put me down as a beta tester. IMHO the best phono preamp was found in the David Hafler DH-101 Preamp.

 

[Gepetto]

Put me down as a beta tester. IMHO the best phono preamp was found in the David Hafler DH-101 Preamp.

The DH-101 used very good transistors in the circuits...

 

[krellmk]

The DH-101 used very good transistors in the circuits...

Wasn't Erno Borbely had something to do with the Halfer gears?

 

[J!m]

I have no control because the product is not coming from me.

I tried to get something moving with former ML dude but he didn’t reply to the information provided.

Now a pre-production prototype is kicking Pass…

Once I know it is available and who the company is I will let you guys know.

 

[wattsabundant]

The DH-101 used very good transistors in the circuits...

I bought an early DH-101 after reading the review in STEREO REVIEW. Although the circuits used low noise transistors the cost savings was in the switches and pots. On mine, the volume control knob rubbed on the balance knob due to a poor fit. The 101 was a definite improvement over the Dynaco PAT-4 which was all I could afford at the time.