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Old 18th April 2012, 03:35 PM   #1
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Join Date: Apr 2012
Default Quad 303 recap

Recently I received a 30 years old 303, it is working and has its original output and PSU caps still on. I am considering replacing with new ones and thinking to raise the original 2K2 microF capacity. I need some help for choosing a suitable value and your opinion about replacement. Moreover checking the voltage value according to Quad service manual, one channel board was showing not stable values, using a multimeter the value keep oscillating fast +/- 0.5/2V, while the other board's values were stable, according to your experience is it acceptable for a 30 years old guy?
As you can argue I am not a professional, but an amateur with good soldering skills and love for vintage equipments.

Thank you in advance for your kind support!
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Old 19th April 2012, 07:46 AM   #2
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Join Date: Apr 2010
No need to add capacitance, but you can put 4700uF caps in there with no issues.
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Old 19th April 2012, 07:55 AM   #3
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Join Date: Oct 2009
Location: Hamburg
Default Here is what I picked from Farnell

Capacitors
~~~~~~~~~~

C100
~~~~

14 mm
Original .68uF
REplaced with 1uF

uk.farnell.com = 1215470
uk.farnell.com = 1215480

C101
~~~~

470uF 10V 5mm

KONDENSATOR, 470UF, 50V
uk.farnell.com = 8767440

uk.farnell.com = 8767440
uk.farnell.com = 9692169

C102
~~~~

9mm

0.01uF


uk.farnell.com = 1413881


c103
~~~~

7mm

100pF

uk.farnell.com = 9520660
uk.farnell.com = 1519280


C104
~~~~

12uF 50V

15uF 350V

uk.farnell.com = 1673477


c105
~~~~

100pF

uk.farnell.com = 1005979


C106
~~~~

50uF 50 V 5 mm

Substitute a 68uF

uk.farnell.com = 1281848


c107
~~~~

3.3pF


uk.farnell.com = 1264865




C108
~~~~

.1 uF 10 mm

uk.farnell.com = 1606139
uk.farnell.com = 1679359
uk.farnell.com = 1215469
uk.farnell.com = 9752609

c109 & c110
~~~~~~~~~~~

1000pf 7 mm


uk.farnell.com=9752455


Big Capacitors
~~~~~~~~~~~~~~~


uk.farnell.com=1198729



RV100
~~~~~

4.7 K

uk.farnell.com = 1227538
uk.farnell.com = 1227568
Trimmer Models 3224 and 3214

RV101
~~~~~

2.2 K

uk.farnell.com = 1227537
uk.farnell.com = 1227566

************************************

Regulator
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


C200
~~~~
330PF 6 mm 13 mm


uk.farnell.com = 1519286

uk.farnell.com = 1678920
C201
~~~~

2.2UF 28mm

uk.farnell.com = 1200762


RV100
~~~~~

4.7 K

uk.farnell.com = 1227538
uk.farnell.com = 1227568
Trimmer Models 3224 and 3214
Heatsink




MJ15003 == 12


resistors fixed value
~~~~~~~~~~~~~~~~~~~~~
MULTICOMP
1%
Metal film

R100
~~~~

220K
uk.farnell.com = 9341552
uk.farnell.com = 9341552


R101/R104/R108
~~~~~~~~~~~~~~

22K
uk.farnell.com = 9341544

R102
~~~~

3.9K
uk.farnell.com = 9341854

R105/R116/R117
~~~~~~~~~~~~~~

4K7
uk.farnell.com = 9341951

R106
~~~~

220R
uk.farnell.com = 9341528

R107/R111/R132
~~~~~~~~~~~~~~

2K2
uk.farnell.com = 9341536

R109/R114/R120/R121
~~~~~~~~~~~~~~~~~~~

100R
uk.farnell.com = 9341099

R110
~~~~

8K2
uk.farnell.com = 9342273

R112
~~~~

39K
uk.farnell.com = 9341862

R113
~~~~

82K
uk.farnell.com = 9342281


R115
~~~~

2R2
uk.farnell.com = 9340246


R118/R119
~~~~~~~~~

1K
uk.farnell.com = 9341102

R122/R126/R128/R129
~~~~~~~~~~~~~~~~~~~

10R
uk.farnell.com = 9341145

R123
~~~~

68R
uk.farnell.com = 9342192


R124/R125
~~~~

R3
uk.farnell.com = 1108094

R130
~~~~

150K
uk.farnell.com = 9341340

R131
~~~~

3K3
uk.farnell.com = 9341749


Regards

Owen
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Old 19th April 2012, 04:21 PM   #4
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Join Date: Apr 2012
Thank you very much for your suggestions!!
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Old 30th May 2014, 09:50 AM   #5
GEEK24 is offline GEEK24  South Africa
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Join Date: May 2014
Location: South Africa
Angry Quad 303 ceramic caps

Hi
Those ceramics on the quad 303 driver boards is a problem ,I need to replace them ,their is so many types ,but what is the correct ones ,with out pulling my hair out ......please any help !!!
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