roggom wrote:
You can change the resistors with higher wattage, i/e 1/2 or even 1 watt if you like. There will be no sonic difference. Some folks swear that metal film resistors sound better than carbon, but in this amp there is no real difference.
oh, but what happens to a charred resistor? resistance goes up or down?
it is a 1/2 watt resistor. I charred it because I used a non regulated 12V supply that actually supplies 14V unregulated power

, tons of hum...
is this charred till it needs a change? I am afraid desoldering and re-soldering might change the sound a lot.

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You have to remember that this amp is running at about 5% of full B+ voltage. If you look at the tutorial you will see the tube graph and this amp operates in a little teeny part of the graph. So it will not sound as warm as other amps i/e Soha or kurt strain amp.
B+ voltage? what is it?
'you will see the tube graph and this amp operates in a little teeny part of the graph' you mean because we only use up to 12V of the tube? and not higher?
this one?

if it is so, can we tweak it to run higher? just asking so that I learn bit more.
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You can increase the value of the input coupling capacitors to 4.7uF, but I think you will see more bass response by using some closed back headphones. Sennheiser has some HD 203's for about $30, they are great for listening to the computer or ipod.
Yes, changing the input capacitors does change the sound; it makes it bassier. I noticed so in the amps I made last time
but re-soldering isn't a good idea... the board is full of components now... hard to re-solder.
But here, I want to ask how are the Audio Technica A500, A700, A900 series? the closed back one. are the bass response good?
is the any chance that you have heard it?
Might just rebuild the whole amp, if I got time... and get the MOSFETs and CCS to the casing to make it cooler.
I noticed cooler it is for the MOSFETs and CCS the warmer it sounds and it won't be so bright.
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Also as your amp "burns in" the sound will become warmer, but it takes some time. You can do a google search on capacitor burn-in. I have had my amp on continuously since the beginning of this thread, it sounds great with my Grado SR 60's.
capacitor burn-in? how long will that take?
it takes on all 3 capacitors?
and will time makes the tube degrade?
so, you have never turn off your amp at all?
and here I want to say thank you for replying and teaching me here. Thanks!
