Sa-8800

hgmartin

Audio Fanatic

• Apr 27, 2005

• #1

Hello, Hernan From Argentina, I need points the Measurement and values in Pioneer SA-8800 for bias and DC Offset.

thanks.

 

P

PMik

Active Member

Banned

• Apr 29, 2005

• #2

Use the SA-9800 adjustment procedure, the schematics similar to your SA-8800 ...and by this fact...so should the adjusment values be... :yes:

 

RastaFish

Where's My Mule?!

• Apr 30, 2005

• #3

I just brought home a very nice SA-8800 this afternoon, and the schematic above does not correspond with the amp board at all. I wish it did, I opened it up and was all ready to make the adjustments!

 

P

PMik

Active Member

Banned

• May 1, 2005

• #4

But the schematics is the exactly the same ...so the values/procedure can be used.

If you like to ?
I will mail PDF docs for the SA-8800 (schematics only) and the SA-9800 (complete servicemanual) for both of you

 

F

foetusized

Guest

• May 1, 2005

• #5

Thanks for that; I need to make those adjustments to my SA-9800 and I printed that out for future reference. All I need now is a non-conducting probe/screwdriver.

The 8800 and 9800 are laid out quite differently inside, so the drawing on the right may not correspond, but the written directions still be useful -- Foe

 

F

foetusized

Guest

• May 1, 2005

• #6

I need some help now. I set the DC offset (which had been way to high) using the above directions with no problems. I then tried to set the idle current (which had been set with the amp power input set to 110v instead of 120v) and ran into problems. The directions say to adjust settings to 56mV and to 70mv, but I've moved all 4 pots around their full range and am getting no higher than 10mV. My meter is set to 200mV DC. I have no load, and the pre-out-main-in jumpers are pulled. Any ideas what I'm doing wrong? -- Foe

 

F

foetusized

Guest

• May 1, 2005

• #7

Figured it out; it was the meter probes that were the problem. Now everything is dialed in. Thank you very much for that scan, PMik -- Foe

 

U

urbain

New Member

• May 1, 2005

• #8

I will mail PDF docs for the SA-8800 (schematics only) and the SA-9800 (complete servicemanual) for both of you

Click to expand...

By the way, do you have the same for the SA-9500 II ? :scratch2:

 

P

PMik

Active Member

Banned

• May 2, 2005

• #9

Urbain ...Im sry! havnt got that one

Could be interesting to see what the MKII version had of improvements ...especial if it was at the power-amp non switching circuit :scratch2:

 

U

urbain

New Member

• May 2, 2005

• #10

The 9500 and 9500 II are not the same at all...

The 9500 looks very much like a 9900 http://www.classicaudio.com/value/pio/SA9500.html the connectors are on its sides, and there's apparently no loudness switch (???)

The 9500-II has the connectors on the back panel, and looks like a SPEC preamp...http://www.classic-audio.com/pioneer/sa9500II.html there's also 2 knobs to adjust the phono cartrdige load...

Also, there's 1 power amp and 2 capacitors per channel in the 9500-II... (2 transformers and 4 capacitors) and big heat sinks... i think its a "bi-mono amp" or something like that... i don't know if it was the same for the 9500

 

Last edited: May 2, 2005

P

PMik

Active Member

Banned

• May 2, 2005

• #11

Looks very nice The build of the power-amp show its a dual mono amp, gives better stereo seperation :thmbsp:

 

siamac

PIONEER VINTAGE

• May 2, 2005

• #12

The inside look of SA-8500II and SA-9500II is almost the same.
The inside look of SA-9500 and SA-9900 is almost the same.
From the 3 Amps SA-7800, SA-8800 and SA-9800, the SA-9800 was the only one with 2 seperate Power Transformator.
Inside SA-8800:

 

siamac

PIONEER VINTAGE

• May 2, 2005

• #13

Inside SA-8500II and SA-9900

 

P

PMik

Active Member

Banned

• May 2, 2005

• #14

Interesting!
It looks like Pioneer keep on there traditions,
inside view of my 1992 model A-757 MKII (100W/8ohm RMS) i dont think its hard to see the mix betwin the above ones

 

U

urbain

New Member

• May 2, 2005

• #15

Wow, the 9500 II looks small next to the 9900 :scratch2:

And I thought my 9500 II was heavy

Thanks for the pics ! :thmbsp:

Whats that switch on the upper left corner on the 8800's back panel ?

 

Last edited: May 2, 2005

siamac

PIONEER VINTAGE

• May 2, 2005

• #16

urbain said:

Wow, the 9500 II looks small next to the 9900 :scratch2:

And I thought my 9500 II was heavy

Thanks for the pics ! :thmbsp:

Whats that switch on the upper left corner on the 8800's back panel ?

Click to expand...

Yes, the SA-9900 is big and heavy, but the Volume-knob is smaler

The backside switch is a Phono Interference Filter:

"This is used to attenuate radio-frequency interference from external electronic or electral appliances or products during record play.
When this switch is set to ON during record play with the cartridge load resistance switch is at 100OHM position, the sound volume will be reduced"

 

F

foetusized

Guest

• May 3, 2005

• #17

Here's a nude photo of my SA-9800 snapped while I was adjusting the offset and bias.

 

F

foetusized

Guest

• May 3, 2005

• #18

SA-9800 Power Boards

Here are the power boards, the ones in the service manual diagram above.

The big discovery I made while making the adjustments, are that the power boards in my SA-9800 are different. The one on the left has blue covers on the two cylinder capacitors (bottom front, next to the blue VR1 pot which is barely seen) and fewer white "risers" on the resistors; the one on the right has black covered caps next to VR2, and more of the white "risers" lifting resitors off the board. I'm guessing that one of the boards was replaced at one time -- Foe

 

U

urbain

New Member

• May 3, 2005

• #19

It would be GREAT if someone could provide the same diagrams and procedures to adjut the SA-9500 II...

Anyone has info on that subject ?