The Fleatique Phase Linear 700 B

[Rex Everything]

Finished stuffing and soldering the board today. If anyone sees any glaring errors, please speak up. Am pretty confident it is good to go though. Will try installing it in the 700 B tomorrow.

View attachment 11748

Since you have this nice 700B can I borrow your Pilot rig.....

 

[BMWR75]

Rex, you have been wanting that Pilot rig back ever since I bought it from you..........but that ain't gonna happen. It is on the never sell list.

 

[Rex Everything]

Rex, you have been wanting that Pilot rig back ever since I bought it from you..........but that ain't gonna happen. It is on the never sell list.

Understandable...it was a moment of weakness for me......but notice I said "borrow"...

 

[BMWR75]

I collected over the years one each of these brand tube amps: Admiral, Dynaco, Sherwood, H.H. Scott, Fisher, Allen, Akai, Pilot and Kegger. Can't break up the set now.

 

[Rex Everything]

I collected over the years one each of these brand tube amps: Admiral, Dynaco, Sherwood, H.H. Scott, Fisher, Allen, Akai, Pilot and Kegger. Can't break up the set now.

Allen 75's?

It just a loan for a..er...while

 

[BMWR75]

Allen 20s. Got one locally from an organ. One from an AKer in Ohio.

 

[Rex Everything]

Allen 20s. Got one locally from an organ. One from an AKer in Ohio.

Sweet! I replaced caps and resistors in mine and bypassed the pot and first gain stage on one input. Nice amps. Mine are currently on lone at a local AK member.....

Excited to get my 75's up and running.....

 

[laatsch55]

Scott, nice work on the board.

 

[BMWR75]

Installed the new WO board this morning. Put the amp on the dim bulb tester. Bulb never dimmed. No magic smoke though, so that is a good thing.

The amp was working fine with the old board installed. So, the problem must be something I've done wrong assembling or installing the new board.

Need some guidance now on troubleshooting steps. Thanks in advance.

EDIT -- I've double checked all the diode orientations, all are correct. Have looked at all the solder joints under a magnifying glass and reflowed a few of them. Looked for solder bridges, can't find any. All the small signal transistors are oriented correctly per the BOM.

 

[BMWR75]

Wow, the silence is deafening...........

 

[Northwinds]

It's the thigamajig that's depolarizing the trilithium capacitor that lineates sinewave oscillations to the transducer and bypassing the output drivers but I defer to someone who can explain better

I love your boobs Bro... wait, that did not come out right...

 

[laatsch55]

Need pics Scott of the board folded out and then bolted in and closeups of the wiring on the board and backplane.

 

[laatsch55]

wHAT WAS YOUR OFFSET?

 

[BMWR75]

Here are the pics Lee. I'll be glad to email them to you if you want to see them in higher resolution (e.g., about 5 MB each), just send me your email address.

All the wires that connect to the boards matched the White Oak wiring instructions for color, except two: old board connection 13 (left and right sides) to WO board 10L and 10R. Instructions said it should be a white wire with green and black tracings. My amp had a white wire with red tracing.

whole board


left side


right side


back


back left side


back right side


Bias connections left side


Bias connections right side


Bottom left connections


Bottom right connections


Back board left and right

 

[BMWR75]

wHAT WAS YOUR OFFSET?

I did't do any testing since the dim bulb stayed bright. Turned the trim pots full counter clockwise before powering up to have them at the minimum.

 

[laatsch55]

Rev "D" board?

 

[BMWR75]

Yes

 

[laatsch55]

The empty hole --#3 needs the purple wire, then the yellow, then the white. The PNP hole is left alone and the #5 hole on the left is left alone(you jumpered that on the backside).

 

[BMWR75]

Thanks Lee. Will look into this tomorrow and report back. Please clarify, do you mean on the left side of the board?

 

[Northwinds]

* sigh *

Such much for levity but I still think my diagnosis sounded cooler