Mikael‑Abdellah‑SE‑KT88 Bias & Voltage readings Help?

[tinitus]

Here is a picture of the SE KT88.

looking very nice

whats inside the box

 

[bigaudioscotto]

Inside looks kind of like a rats nest but it sounds fantastic.

 

[alexg]

Guys would there be an increase in bass
by changing the .22uf coupling cap to .68uf
with no ill effects.

I doubt that you will hear more bass.

There are coupling capacitor calculators and the resulting low frequency on the net.

 

[costis_n]

Guys would there be an increase in bass
by changing the .22uf coupling cap to .68uf
with no ill effects.

By using resistors in the place of the choke, you increased the outpout resistance of your power supply.

This causes problems in damping, especially in the bass. The power supply cannot keep up with the fluctuating demand if the output stage.

You need to install the choke to improve the bass.

I am running an EL34 SE here, my design. I have a 7H choke, I got it off ebay.

 

[bigaudioscotto]

That is great advice,had not even thought about the choke
but it makes more sense to start there.
thanks for the heads up.


Scott

By using resistors in the place of the choke, you increased the outpout resistance of your power supply.

This causes problems in damping, especially in the bass. The power supply cannot keep up with the fluctuating demand if the output stage.

You need to install the choke to improve the bass.

I am running an EL34 SE here, my design. I have a 7H choke, I got it off ebay.

 

[bigaudioscotto]

I was looking at the Hammond 155G 7H, 40ma, 340 ohms, 400VDC
is that voltage high enough.
it looks like they don't make one in 500volt for 300 ohms that
is what I am using now with the resistors.
any suggestions or will I be fine with that Hammond.

By using resistors in the place of the choke, you increased the outpout resistance of your power supply.

This causes problems in damping, especially in the bass. The power supply cannot keep up with the fluctuating demand if the output stage.

You need to install the choke to improve the bass.

I am running an EL34 SE here, my design. I have a 7H choke, I got it off ebay.

 

[costis_n]

I was looking at the Hammond 155G 7H, 40ma, 340 ohms, 400VDC
is that voltage high enough.
it looks like they don't make one in 500volt for 300 ohms that
is what I am using now with the resistors.
any suggestions or will I be fine with that Hammond.

well the "economy line" of Hammonds seems to be unsafe with 500Volts, you should look for their 193 Series, and find one that is rated for the current your amplifiers draws.

 

[costis_n]

Also, the less Ohms the better the performance.

 

[bigaudioscotto]

I will do the 193 series.

Also, the less Ohms the better the performance.

 

[bigaudioscotto]

Sub Out ?

How can I add a Sub output to this amp.

Scott