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Old 5th April 2011, 05:35 PM   #1
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Lightbulb Denon UPA- F07 amp Mods

Hi Im doing a few mods to a Denon Upa-F07 Amp and I have a few questions.

1. Im replacing some Film capacitors can I put them in any way round or have they got a neg and positive.

2. Im also replacing some ceramic caps can I put them anyway round to.

3. Will replacing the 2 larger caps Power caps( 6800uf 50v) with 10000uf 50v ones create any problems.(they do fit)

4. Im thinking of bypassing the tone controls. From the volume pcb 5 wires(joined together) route to the tone control location, obviously '1 right out, 1 right in,' '1 left out, and 1 left in,' and a ground. how sould I go about this.

I was thinking route both right and left into each other respectivly using some spare capciotor leg wire, yet still conection the ground in the normal way.

Many Thx in advance
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Old 9th April 2011, 05:02 PM   #2
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Any Help on this, much appreciated
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Old 10th April 2011, 03:34 AM   #3
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Here's a thread that I posted elsewhere a few months ago on the upgrades I performed to a Denon UDRA-M7 receiver - its tone control section seems to be similar to the UPA-F07.

Denon UDRA-M7 Receiver Upgrades

In addition, I changed the opamp on the tone-control board to an LT1213 and changed a few caps on the tone-control board to Elna Cerafines. That seemed to be sufficient, but you can experiment with other opamps/caps. I would not recommend bypassing the tone-control board.

If you're changing the PSU caps, stick to the same values or at most 10-15% larger. The ripple current stress on the transformers will increase with larger caps.
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Old 10th April 2011, 06:03 AM   #4
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Many thx for the info Linuxguru and for the link
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