Model ONE Build - S/N 0005 & 0006

[Vintage 700b]

Mounted the auxiliary power supply transformer to the shield and terminated all primary and secondary leads of both main and aux toroids.

Super Clean Eric,
You have set the standard !

 

[laatsch55]

Have to 2nd that....beautiful work...

 

[Bob Boyer]

That build is gorgeous. A work of art for sure!

 

[Hexis22]

Backplane boards wired. very straight forward as compared to the typical 700 build.

Having the fuse holders next to each backplane works well for direct wiring without long bundled wires.

 

[Hexis22]

Power control board, speaker relay output, and AC wiring completed.

Power control board wiring secured to the transformer shield with 3M tie wrap mounts.

 

[Hexis22]

Power Supply caps installed and wired with12AWG.

 

[Hexis22]

It's now officially amp #0006.

 

[Hexis22]

Countersink bit used on all heat sink holes to help prevent damage to output sil-pad isolators.

 

[Hexis22]

All initial power up testing completed successfully with power supply rail voltages of +/- 111.8 VDC.

 

[Hexis22]

Outputs installed, torqued to 4 in/lb, and confirmed isolated from chassis ground.

 

[Hexis22]

Output offset measured +/- 0.5mV, that's 0.0005V. Outstanding...

Bias set to 350mV.

 

[laatsch55]

I would bet by the 5th or 6th build of a model One.....you would probably have it down pat, complete with your own little touches....nice stuff Eric, really nice. When you get ready to ship one I can email you a shipping label. I do save money with a commercial Fed _Ex account..

 

[laatsch55]

The bias wires, regardless of which iteration of amp involved always looked out of place simply because they were so untidy....I see you worked on that a bit...

 

[Hexis22]

The bias wires, regardless of which iteration of amp involved always looked out of place simply because they were so untidy....I see you worked on that a bit...

Not sure this will be the last iteration, but I will be modifying the first amp to match.

 

[laatsch55]

Not necessary for me , but i bet it is to you....nothing wrong with seeing the evolution of a skill.

 

[Vintage 700b]

Not sure this will be the last iteration, but I will be modifying the first amp to match.

Eric,
Your routing details are impeccable. The little touches are so well thought out, really appreciate you posting such detailed pictures.
It is always such a joy working with the Joe's designs, and you take it to next level with your attention to detail.
Super nice !

 

[Hexis22]

Not necessary for me , but i bet it is to you....nothing wrong with seeing the evolution of a skill.

Necessary for me for a number of reasons.

Like you mentioned, I never liked large loops of wire connecting the bias circuit between the backplane and control boards (potential improvement option for Model One specific design by routing the bias signals to pin connectors).

When building the first amp, I wanted to minimize that wire loop and cut it shorter than I feel comfortable, not allowing sufficient service loop.

The second build addresses this concern.

 

[Gepetto]

Eric, Mark and Lee
Always working to make it better. Your amps will very soon benefit from this latest update.

 

[Hexis22]

Love it!!

Now that’s a robust bulk cap Ground connection and layout update! No more stacking multiple terminals on a single connection.

 

[Gibsonian]

Beefy overkill. My favorite. Very nice.