700 Series 1 Build

[Hexis22]

It's alive!!

DC rail voltage is +/- 107.5V at 120V AC input.

The secondary winding for meter lamps measure 7.35V AC.

DCP relays clicked as expected.

 

[laatsch55]

Same transformer, better chance forahottie in the earlydays.

 

[Gepetto]

Also installed brand new heat sinks from Joe after chamfering all holes to help prevent cutting SIL pads during installation. All holes were very sharp from the punching process.

Beautiful heat sinks!! And NO thermal paste to deal with...

They are not punched Eric, they are laser cut. and then time saved.

 

[Hexis22]

In the spirit of "always making it better", I updated wiring to the fuse holder tips to include a service loop.

I was reminded that the tips of the fuse holders move up and down during fuse installation, potentially stressing solder joints due to movement.

I dislike redoing work, but this is a much more robust solution.

 

[gene french]

In the spirit of "always making it better", I updated wiring to the fuse holder tips to include a service loop.

I was reminded that the tips of the fuse holders move up and down during fuse installation, potentially stressing solder joints due to movement.

I dislike redoing work, but this is a much more robust solution.

looks like dallas clover leaff!!!

nice!!!!!

 

[Vintage 700b]

In the spirit of "always making it better", I updated wiring to the fuse holder tips to include a service loop.

I was reminded that the tips of the fuse holders move up and down during fuse installation, potentially stressing solder joints due to movement.

I dislike redoing work, but this is a much more robust solution.

Really nice Eric.
It's the attention to details that sets a great build apart, and you excel at that..... like the solder tipped ends
for the WA speaker protect board. Definitely in the spirit of "Always making it better"

 

[Vintage 700b]

Also installed brand new heat sinks from Joe after chamfering all holes to help prevent cutting SIL pads during installation. All holes were very sharp from the punching process.

Beautiful heat sinks!! And NO thermal paste to deal with...

Hello Eric et al,
I have a quick question on the new heat sinks. It may be an optical illusion in the picture, but are the breaks at 90 degrees here sharp corners? On most press brake dies to form a bend at any angle we use a gentle radius, depending on the material to reduce stress risers, and subsequent cracking. (Angle * (π / 180) * (Radius + K-factor * Thickness). I believe these are 5052 aluminum, which will "cold work" through the bending process. It appears that the break line is "relieved" every couple inches, and these relief cuts are staggered from side to side, however it appears that the actual bend has sharp corners inside and out. We will often include a "relief" cut to stop a potential crack. Is that what I am actually seeing, or is it just the photograph?

 

[Hexis22]

Really nice Eric.
It's the attention to details that sets a great build apart, and you excel at that..... like the solder tipped ends
for the WA speaker protect board. Definitely in the spirit of "Always making it better"

Thanks for the comments.

All wire tips are tinned before terminating, especially if terminating into phoenix connectors.

Also looks like I have a solder tail to cleanup as well.

 

[Vintage 700b]

Thanks for the comments.

All wire tips are tinned before terminating, especially if terminating into phoenix connectors.

Also looks like I have a solder tail to cleanup as well.

Thanks, I always tin my wire ends as well, but not everyone does, and that of course is where we will see trouble down the line.
Really nice work Eric.

 

[gene french]

notebook fillin up!!!

 

[Gepetto]

Hello Eric et al,
I have a quick question on the new heat sinks. It may be an optical illusion in the picture, but are the breaks at 90 degrees here sharp corners? On most press brake dies to form a bend at any angle we use a gentle radius, depending on the material to reduce stress risers, and subsequent cracking. (Angle * (π / 180) * (Radius + K-factor * Thickness). I believe these are 5052 aluminum, which will "cold work" through the bending process. It appears that the break line is "relieved" every couple inches, and these relief cuts are staggered from side to side, however it appears that the actual bend has sharp corners inside and out. We will often include a "relief" cut to stop a potential crack. Is that what I am actually seeing, or is it just the photograph?

I think that is a Joe question, not an Eric question since I am the designer of these parts.

I worked with my supplier on the creation of the special window die for making these. The inside bend is quite sharp but the outside radius is a nice smooth radius with no cracking.

The relief cuts are a design feature to prevent 'pulling' of the flange mounting holes for the transistors into an egg shape. That 'pulling' is completely eliminated by having the adjacent relief cut so that you retain nice round holes as well as a perfectly flat mounting surface in the mounting area for the TO-3 transistors.

Part of the secret sauce that I bring to the party...

 

[laatsch55]

And what a party it is..

 

[Hexis22]

Completed all wiring, minus faceplate, and stabbed all output drivers.

Wired up RCA's using RG316 coax directly to the control board, no attenuator pots.

 

[Hexis22]

Checked for shorts to chassis ground and passed all power up testing.

Bias set to 350mV.

Output offset measured -0.6mV on Left and 1.0mV on Right.

The headless beast is playing music streaming over an iPhone into a Cobalt Dragonfly DAC.

 

[Gibsonian]

Checked for shorts to chassis ground and passed all power up testing.

Bias set to 350mV.

Output offset measured -0.6mV on Left and 1.0mV on Right.

The headless beast is playing music streaming over an iPhone into a Cobalt Dragonfly DAC.

Best looking headless Beast I've ever laid eyes on.

 

[Gepetto]

Best looking headless Beast I've ever laid eyes on.

you will be happy...

 

[Gibsonian]

you will be happy...

U betchur biffy I will!

 

[Gibsonian]

This is one of those girls with a to die for body, and a face that doesn't quite match at this point....... Perfectly fine with me, my kinda girl.

 

[Hexis22]

This is one of those girls with a to die for body, and a face that doesn't quite match at this point....... Perfectly fine with me, my kinda girl.

I realize your partial to the Series 1, however I’d be lying if I wasn’t hoping you would find a set of 700B meters to go with Joe’s new 700B faceplates and LED lighting.

Regardless, it sounds fantastic…

 

[Gibsonian]

Regardless, it sounds fantastic…

That's what I like to hear! I'm ok with the old faceplate. Perty her up as much as possible is all I can ask since it's off. She'll sing so well I expect that I will enjoy gazing upon her worn face!