Derek92994's 700 Ser II White Oak conversion

[laatsch55]

Only want one ground connection to the chassis...prevents ground loops.

 

[laatsch55]

just for shits and giggles...

 

[laatsch55]

I have 3 fully comp 400's with the revA backplane boards with electrolytic caps, they are 47uf 160 volt caps. Should they be removed?

Sounds like it Mark..

 

[Skratch]

Question, why is there no lead going from bus bar to centre connector on right backplane but the left backplane has?

Only 1 chassis ground on left board and no ground on the right board. Your amp is correct

 

[derek92994]

Sounds like it Mark..

Yep, those caps will fk your world up

 

[Skratch]

Sounds like it Mark..

They have been running for around 8 years with no problems. A 400 has 80 vdc rail voltage and the caps are rated for 160?

 

[derek92994]

They have been running for around 8 years with no problems. A 400 has 80 vdc rail voltage and the caps are rated for 160?

I got about 6-7 years out of them, but dont really know what caused that 1 cap to fail.

 

[derek92994]

Dc Offset is 0.5mv left and 1.0mv right after removing caps from backplane
Pretty much the same

 

[laatsch55]

Yep, they would have no effect on offset.

Mark, I have not removed any that are not wounded...

A shorted output can take them out Darc..

 

[Gepetto]

I have 3 fully comp 400's with the revA backplane boards with electrolytic caps, they are 47uf 160 volt caps. Should they be removed?

If you like.

The current artworks do not have that position anymore. I got tired of answering the question of why those caps were missing in my kit

They only become reverse biased when:

You have an output device failure like Darcy did

AND

You blow one of the rail fuses.

Your choice Mark, none of my mules have them populated. They do no harm if all is good.

 

[Skratch]

Its easy to remove them, snip snip just like my vascetomy

 

[derek92994]

After all the chores are done, will check fuses and connect to pre, will play some normal level music to see how it goes.

 

[laatsch55]

Change out those 2 ampers bud, they really don't fit...

 

[derek92994]

Since removing the 4 caps from the backplane, the amp does not swing the meters on power up anymore, a damn good sign.

 

[laatsch55]

Yes it is..

 

[laatsch55]

Got er on the Jamos??

 

[derek92994]

Got er on the Jamos??

Absolutely, I could only stand the combo mid range/tweeters on the Bic RTR's for so long. Talk about Squarking, even with them turned right down.

 

[laatsch55]

How's it doing?

 

[derek92994]

Going to buy an Audio Technica VM540ML cartridge next pay. The reason? The cartridge that I use for the AT440MLa and AT150MLX has a channel imbalance and I have had enough of using the balance control. Also the reviews say there are some nice improvements with this cart. The 440 and 150 Stylus will also fit it. Its hard to beat a Microline stylus for tracking, especially on the inner groove.

Not my turntable but here is the cart:


Specs:
Frequency Response 20-27,000 Hz
Channel Separation 28 dB (1 kHz)
Vertical Tracking Angle 23°
Vertical Tracking Force 1.8-2.2 g (2.0 g standard)
Stylus Construction Nude square shank
Recommended Load Impedance 47,000 ohms
Coil Impedance 2,700 ohms (1 kHz)
DC Resistance 800 ohms
Coil Inductance 460 mH (1 kHz)
Output Voltage 4.0 mV (at 1 kHz, 5 cm/sec)
Output Channel Balance 1.0 dB (1 kHz)
Stylus Shape 2.2 x 0.12 mil MicroLine®
Cantilever Aluminum tapered pipe
Static Compliance 40 x 10-6 cm/dyne
Dynamic Compliance 10 x 10-6 cm/dyne (100 Hz)
Mounting Half-inch
Recommended Load Capacitance 100-200 pF
Stylus Size 0.12 x 2.2 mil
Weight 6.4 g (0.2 oz)

 

[derek92994]

How's it doing?

Its good to have her back, a fine amp. Running on top of the cabinet for a while.