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AU-D9 for restoration

BTW: the reconditioned driver board is back in the Amplifier and dialled in perfectly.

I have also restored (recapped) the F-3259 protection board. (sorry no pictures)

There seems so little interest in this thread now - I will continue to post pictures for Peter's benefit as it is helping him with his restore.

Next up, the boards behind the front panel - leaving the EQ board until last. :)
 
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I’m very interested, but I just had nothing to say. I sold mine over a year ago. I will be very interested in your listening impressions after the restore, and what speakers you used with it.

On my part, I found it very hard to match speakers with mine, and finally found a good match with Genesis Physics 2 Speakers. That was a match made in heaven!
 
AUD101 said:
John did you change out the main ice cube relay on F-3259 while you were recapping
Click to expand...
Hi, no I haven't actually, as I haven't been able to find any information about suitable replacement relays. It uses 3 different ones, the 'cube' relay (black plastic), another that looks like a small MY4-02 type (transparent cover) - but isn't (actually it is, see a later post), and a miniature relay (for the headphones) that looks like the ones used in the AU-X1 - this one is definitely a Fujitsu. In the absence of any replacement info I was going to leave them - they work OK, but I didn't want to go to the trouble of removing them and testing them unless I had a line on replacements. I could wire in a G5V as a replacement for the miniature relay, but as I said they work ok.

Do you - or anyone - have any info on the relays? - keen to replace them if possible. ;)
 
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Control Amp F-3466

Before
IMG_2552a.jpg

After
IMG_2555a.jpg

Notice the wire links across the C9 position, due to the use of a purpose made quality bipolar at position C10. For the wire links I used the wire offcuts from the quality bipolars as, using wire from lesser capacitor roughens the sound considerably :D
 
Selector PCB F-3251

Before
IMG_2553a.jpg

After :)
IMG_2554a.jpg

Notice in the 'before' picture the VERY leggy (and uninsulated) leads of the mains switch snubber (brown disk) - and now in the above picture the leads have been much shortened, and are thus safer from wandering fingers. :)

One whole electrolytic capacitor changed here - don't tell me I don't show you interesting stuff :D
 
Hyperion said:
Control Amp F-3466

Before
View attachment 1578430

After
View attachment 1578431

Notice the wire links across the C9 position, due to the use of a purpose made quality bipolar at position C10. For the wire links I used the wire offcuts from the quality bipolars as, using wire from lesser capacitor roughens the sound considerably :D
Click to expand...

John, why did you use a bipolar at C10 and a wire at C9 instead of replacing those capacitors with the "normal" new capacitors? What kind of bipolar did you use?
 
John - that's correct - three relays:

Speaker-A (Ice cube) relay is usually a Fujitsu FRL-264 DO24 which can be replaced with your standard Omron MY4 02 24DC / FINDER 55.14.9.024.0000 and cutting off the appropriate pins

Speaker-B relay sitting under the speaker socket block is an Omron G2Z-222P - unfortunately no NEW relay currently exists with this form factor / pin layout - however there are a few sellers on that auction site who sell a drop-in replacements (search for example: Omron G2Z-222P 24V 24VDC / Ersatz Relais / Replacement Relay) - but caution advised here as due to the confined space / surrounding components etc under the speaker socket block there maybe not enough wiggle room to accommodate :dunno: if these replacements are not of the same exact base dimensions as the original

There is however an NOS Omron G4Z-2282P 24V DC which is a pin for pin direct drop in available - also available on that auction site - unfortunately the seller does not have any info on their contact rating - I have a couple, on opening up one they have single small contacts - while the original has dual finger larger contacts

The Headphone relay (lRL1) is a Fujitsu 221DO24 - unfortunately I haven't found any direct drop in pin for pin - but as you mentioned in your reply above - Omron G5V could be used as was done for the AU-X1
 
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...also here is my solution for the trimmers on the EQ Amp & Power Supply Board F-3252

AU-D9 - Board F-3252 - (Trimmers Bourns 3266W - 12 Turns).JPG

Trimmer's are Bourns 3266W - 12 Turns
 
...also here is my solution for the trimmers on the EQ Amp & Power Supply Board F-3252

AU-D9 - Board F-3252 - (Trimmers Bourns 3266W - 12 Turns).JPG

Trimmer's are Bourns 3266W - 12 Turns
 
P. Hageman said:
John, why did you use a bipolar at C10 and a wire at C9 instead of replacing those capacitors with the "normal" new capacitors? What kind of bipolar did you use?
Click to expand...

Some older designs use two regular caps hooked up in reverse polarity to one another to create a bipolar. With good modern bipolar caps there's no reason to do so. Might be the case here.
 
EngineerNate said:
With good modern bipolar caps there's no reason to do so. Might be the case here.
Click to expand...
Yes, that's it - quality bipolars didn't seem to exist back then, or at least were more expensive than 2 standard ones back-to-back. But now, a purpose made audio grade bipolar is far better than 2 back to back. ;)
 
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AUD101 said:
John - that's correct - three relays:

Speaker-A (Ice cube) relay is usually a Fujitsu FRL-264 DO24 which can be replaced with your standard Omron MY4 02 24DC / FINDER 55.14.9.024.0000 and cutting off the appropriate pins

Speaker-B relay sitting under the speaker socket block is an Omron G2Z-222P - unfortunately no NEW relay currently exists with this form factor / pin layout - however there are a few sellers on that auction site who sell a drop-in replacements (search for example: Omron G2Z-222P 24V 24VDC / Ersatz Relais / Replacement Relay) - but caution advised here as due to the confined space / surrounding components etc under the speaker socket block there maybe not enough wiggle room to accommodate :dunno: if these replacements are not of the same exact base dimensions as the original

There is however an NOS Omron G4Z-2282P 24V DC which is a pin for pin direct drop in available - also available on that auction site - unfortunately the seller does not have any info on their contact rating - I have a couple, on opening up one they have single small contacts - while the original has dual finger larger contacts

The Headphone relay (lRL1) is a Fujitsu 221DO24 - unfortunately I haven't found any direct drop in pin for pin - but as you mentioned in your reply above - Omron G5V could be used as was done for the AU-X1
Click to expand...
That is extremely helpful!!! - thank you - clearly I was wrong about the smaller transparent case relay not being a MY4-02-DC24 - I stand corrected. ;)
 
John, what value did you use for the replacement C9 + C10 capacitor. I think they are both 10uF 50V, so a replacement would be 5uF 100V? I could not find such a bipolar capacitor with that value.
 
John, thanks. I am going (again) to my local electronic shop :) Turned out the complete recap set I got is not so complete as it should be................. Other stupid question, how is the volumeknob secured? A small allen key? :dunno:
 
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