I believe it's a capacitor but no clue what type/brand etc.
Anyone know the value, etc of this blue rectangle on top of pic? It's used on a Valvet E2 solid state class A amplifier
Anyone know the value, etc of this blue rectangle on top of pic? It's used on a Valvet E2 solid state class A amplifier
Easy just seen those before it is surely a input cap just by the looks, also modern plastic/capacitors all look alike im guessing by size and location cause i cant clear see a point it could be 22uF or 2.2uF but being more common to see 2.2uF for a input cap my guess goes for the later, then the 100V cause it states 100 after the tolerance letter 'K'
In other models they seem to use a 4,7uF Mundorf
With a 50k input impedance both seem to be about right.
With a 50k input impedance both seem to be about right.
Epcos would normally write 2.2 as 2U2! So probably 22
JP looking at a sample the long top number is not the part number! No idea how that marking relates. Most likely a production code.
JP looking at a sample the long top number is not the part number! No idea how that marking relates. Most likely a production code.
It is an EPCOS capacitor - you can tell from the manufacturers logo.
They are marked as so:
Top Line: Lot number + Series Number
Bottom Line: Capacitance + Tolerance + Voltage Rating + Date of Manufacture
So you have an EPCOS 522 series, 22u 10% 100V manufactured in May 2016.
If it was 2.2u then it would have been 2u2.
See https://forum.digikey.com/uploads/short-url/zoCWNTFArcJ62a6QEhTwUK6fbD2.pdf for reference
This capacitor is listed at Digikey - https://www.digikey.com/en/products/detail/epcos-tdk-electronics/B32524Q1226K000/2060965
No stock but that gives you the package size and lead spacing , so you can (hopefully) find a compatible replacement if that is want you want to do
They are marked as so:
Top Line: Lot number + Series Number
Bottom Line: Capacitance + Tolerance + Voltage Rating + Date of Manufacture
So you have an EPCOS 522 series, 22u 10% 100V manufactured in May 2016.
If it was 2.2u then it would have been 2u2.
See https://forum.digikey.com/uploads/short-url/zoCWNTFArcJ62a6QEhTwUK6fbD2.pdf for reference
This capacitor is listed at Digikey - https://www.digikey.com/en/products/detail/epcos-tdk-electronics/B32524Q1226K000/2060965
No stock but that gives you the package size and lead spacing , so you can (hopefully) find a compatible replacement if that is want you want to do
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So interestingly the “upgraded“ version of this amp uses a Mundorf MCap EVO Aluminum Oil 4.7uf and swaps the AD711 op-amp for a Burson discrete. I’m basically wanting to do this same with Jupiter cap and sparkos discrete.
any reason why the old uses 22uf but upgraded is only 4.7uf with most everything the same?
old
new
any reason why the old uses 22uf but upgraded is only 4.7uf with most everything the same?
old
new
"any reason why the old uses 22uf but upgraded is only 4.7uf with most everything the same?"
because sometimes is better to limit low fr response
no need to go down to 2Hz when 10Hz is plenty
(just an example)
because sometimes is better to limit low fr response
no need to go down to 2Hz when 10Hz is plenty
(just an example)
Completely out of subject, but this image shows a collection of bad practices:
The layout is exaggeratedly aerated, meaning increased parasitic inductances (which may or may not matter in this case), yet the hole spacing for the resistors is insufficient, meaning thermo-mechanical stress, leading to resistance variation and premature failure.
Probably of minor importance, since audiophile products focus on much more important aspects, like the subjective user's experience
The layout is exaggeratedly aerated, meaning increased parasitic inductances (which may or may not matter in this case), yet the hole spacing for the resistors is insufficient, meaning thermo-mechanical stress, leading to resistance variation and premature failure.
Probably of minor importance, since audiophile products focus on much more important aspects, like the subjective user's experience
What I find worse is just not using a proper PCB layout with a big fat ground layer (either top or bottom).
I don't know when those boards were made, but at least for 15 years it's pretty easy to get 2-layer boards.
Gold plated and all.
I don't know when those boards were made, but at least for 15 years it's pretty easy to get 2-layer boards.
Gold plated and all.
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It's not, although they last an awful lot longer (and solder very well 🙂 ), but hey it's high-end anyway, so why not?
These days the price is close to negligible.
In the case of being beneficial, a lot of audiophile practices can be removed.
These days the price is close to negligible.
In the case of being beneficial, a lot of audiophile practices can be removed.
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Can anyone post the schematics?
Not sure if all the criticism is justified. Looks like well designed amp.
Not sure if all the criticism is justified. Looks like well designed amp.