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Quad 909 Modification

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Quad 909 Modification

Post by alvin1118 on Thu Feb 06, 2014 12:05 pm

Hello guys,

I posted a thread in neighboring country forum, thought I should post it here as well.

I get influenced and acquired a Quad 909, for my new Harbeth P3ESR.

Reviews, discussions, revisions, modification of Quad 909 from internet makes me very itchy to get mine "upgraded".

Assuming IAG did a good job in main transformer, resistors, and transistors, I'll be replacing the mainland-made capacitors with BHC, Wima, Nichicon, Silvered Mica. I'll also be removing the Quadlink ampbus with phono RCA jacks, rewire all internal wire with MOGAMI cable, copper sheet tape the main trans to reduce possible EMI. Quad binding post are made by CLIFF UK, assumed it's good and will not touch it ;D

Gathered most of the components and materials ready, will start diy post CNY!!







Excited!

alvin1118
Dealer\Reseller\Trader\Service Provider
Dealer\Reseller\Trader\Service Provider

Number of posts : 189
Age : 32
Location : Singapore & Malaysia
Registration date : 2009-02-16

Character sheet
Source(s):
Amplification:
Speakers:

http://alvinchc.blogspot.sg/

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Re: Quad 909 Modification

Post by alvin1118 on Thu Feb 06, 2014 12:06 pm

Internal Pic of my Quad 909:

Confirmed china-made. Capxon capacitors....


Quadlink must removed  ;D


+ve -ve DC supply and speaker output wiring will change & solder-on instead

alvin1118
Dealer\Reseller\Trader\Service Provider
Dealer\Reseller\Trader\Service Provider

Number of posts : 189
Age : 32
Location : Singapore & Malaysia
Registration date : 2009-02-16

Character sheet
Source(s):
Amplification:
Speakers:

http://alvinchc.blogspot.sg/

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Re: Quad 909 Modification

Post by alvin1118 on Thu Feb 06, 2014 12:06 pm

Hello Guys,

Spent good 12hrs yesterday from 10am - 10pm to complete the mod ! Exhausted  Sad
It may look simple, but it isn't, trust me  >Sad

Naked Transformer


Copper Taped Shielded  ;D


Reservoir Capacitors


Replaced with BHC & Mounted AC Trans




MOGAMI Snake Speaker Cable, 2.5mmsq each core, used for internal wiring; very flexible & quality !


Quad Link removed, replaced RCA input with solid copper RCA jacks




Chassis, Rectifier Board Almost There


Original Quad Amp Board




Replace low-cost capacitors with quality ones


Both Amp Boards done, next to secure them on chassis & re-wire


That's it! Done!


Beautiful isn't it? I really like my workmanship. LOL  ;D


Powered up & measure the necessary with DMM:

Positive Rail to Virtual Ground Measured +58.4VDC (specs +57.8 )
Negative Rail to Virtual Ground Measured -54.6VDC (specs -53.4)

Supply voltage normal, pretty close to specs, likely due to higher AC incoming voltage in my place.

Right Speaker Output 0.05mVDC - Okay
Left Speaker Output 0.02mVDC - Okay

Safe to connect source & speakers! I didn't connect to my Harbeth yet of course, hooked up a pair of test (lousy full range) speakers, and it SINGs! 

Left overnight for 8hrs+, runs warm & still singing. Should stress test it couple of days & measure the parameters again before I connect my P3ESR! ;D

alvin1118
Dealer\Reseller\Trader\Service Provider
Dealer\Reseller\Trader\Service Provider

Number of posts : 189
Age : 32
Location : Singapore & Malaysia
Registration date : 2009-02-16

Character sheet
Source(s):
Amplification:
Speakers:

http://alvinchc.blogspot.sg/

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Re: Quad 909 Modification

Post by adrian4454 on Thu Feb 06, 2014 1:15 pm

Wonderful!, Thanks for sharing. Yes I like you work too!

adrian4454
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Re: Quad 909 Modification

Post by sph on Thu Feb 06, 2014 2:02 pm

Nice work!
I'm sure you will like what's to come from your Harbeths when you hook them up together.

sph
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Age : 58
Location : PJ
Registration date : 2009-03-04

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Re: Quad 909 Modification

Post by alvin1118 on Thu Feb 06, 2014 10:16 pm

Thanks for the compliments :-)

alvin1118
Dealer\Reseller\Trader\Service Provider
Dealer\Reseller\Trader\Service Provider

Number of posts : 189
Age : 32
Location : Singapore & Malaysia
Registration date : 2009-02-16

Character sheet
Source(s):
Amplification:
Speakers:

http://alvinchc.blogspot.sg/

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Re: Quad 909 Modification

Post by boxer on Fri Feb 07, 2014 7:27 am

great work & good details, helpful to quad 909/606 whom wishes to upgrade diy

boxer
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Age : 54
Location : KL
Registration date : 2009-03-05

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Re: Quad 909 Modification

Post by scwong on Sun Feb 09, 2014 2:16 pm

Nice. Can write a review? It would b wholesome.

scwong
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Age : 53
Location : jb
Registration date : 2009-03-06

Character sheet
Source(s): cd format
Amplification: pre/pwr
Speakers: bookshelf

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