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The ugliest headphone amp on the planet? - Page 7

post #91 of 94
You DO realise you just added to the "looks good,I bet it sounds good" gene pool right ?
post #92 of 94
Could you fit a plastic bushing or even a greased o-ring in the hole to improve the rods action?

Cool project!
post #93 of 94
this might be a little odd to suggest, but would it be out of line to ponder the thought of hacking the circuit to add a dc servo so you didn't need the output caps - might make it sound better too...
post #94 of 94
Thread Starter 
Quote:
Originally Posted by alanb
1. Install Alps 50kohm Blue Velvet volume control - needed 'cos the original crackled like sweet wrappers. I'd put a 100kohm pot in but reverted to a 50kohm to make the amp as close to the original design as possible. Sounds fine but seems to require substantially more rotation for a given volume.
Just a thought but try replacing the 220K resistor (the one from pot wiper to ground) with a 50K or 100K type.

Quote:
Originally Posted by alanb
2. Replace the 6 1,000 microfarad capacitors with Panasonics. This was a major improvement - gonewas the bloated and overblown bass and in its place a much more evenly balanced and detailed sound. Not only that, but the caps themselves are shorter and don't foul the extension shaft for the volume control.
Yes. Your original caps would have been as dry as a stick considering they're over 20 years old, the fresh caps should have made a pretty marked improvement overall. Parallel a couple of 3300uF caps on (per channel) and you'll notice an even bigger improvement.

Quote:
Originally Posted by alanb
3. Replace the original TL082 op amp with a socketed OPA2134. This is another major improvement and has given the amp a much "quicker" and more controlled sound.
As you've socketed the amp try the el cheapo NE5532 as well, you may like it

Quote:
Originally Posted by alanb
Overall a massive improvement. I'm now happy to use this as my main headphone amp.
Excellent! Now replace those noisy resistors and you'll be in heaven. Pics would be awesome!!
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