My Ella Preamplifier Died - So I fixed It!
ฝัง
- เผยแพร่เมื่อ 9 ก.พ. 2025
- My Ella Valve Preamplifier from Erhard Audio has unexpectedly died - half the valves are without heaters! Join me on this quest to revive it.
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Equipment used to film this video:
iPhone 15
Rode Wireless GO II
Editing Software: Davinci Resolve
Editing Computer: M2Pro Macbook Pro
Monitor Speakers: Yamaha NS-10MX
Monitor Amplifier: NAD 3120
These are well underrated for the current draw, certainly need upgrading to increase reliability & reduce heat dissipation.
Usual solution is a bigger rectifier mounted to the case using fly leads back to the PCB.
That foil lined mahogany or oak chassis is quite beautiful
Yes it is, although not the best to bolt heatsinks to!
Too hot to touch is still too hot. Great job of diagnosis! Get some even bigger heatsinks on the rectifers.
Dan
Yeah - I think you're right. Got any suggestions for some nice clip on heatsinks???? It worked for 5 years the way it was, so I'm hoping it will be OK for a little while until I come up with something a little more elegant. I don't think higher powered rectifiers will work because the holes in the PCB will be too small for the leads.
Make the biggest heatsinks that will fit (looks like you have lots of room for taller sinks) out of sheet copper. Easy to cut and fold. Just tack them on with some thermal epoxy.
Not the most elegant solution, but they are not going to be seen.
Dan