Tube_Dude
Why don't I just change the 22 ohm resistor back to 220 ohm and the 562ohm to 5k? This will make Frank happy and it will then jive with the 8417 schematic that I posted.
Note: I think the credit for finding this 8417 schematic actually goes to Wheezer because I believe he posted it first.
Now, what value of bias pot will allow both the usage of 6550 and Kt88 tubes?
What about using EL34's also?
Is anyone familiar with the Quicksilver mod that uses a 6922 in the front end?
Joe
Why don't I just change the 22 ohm resistor back to 220 ohm and the 562ohm to 5k? This will make Frank happy and it will then jive with the 8417 schematic that I posted.
Note: I think the credit for finding this 8417 schematic actually goes to Wheezer because I believe he posted it first.
Now, what value of bias pot will allow both the usage of 6550 and Kt88 tubes?
What about using EL34's also?
Is anyone familiar with the Quicksilver mod that uses a 6922 in the front end?
Joe
Making Frank happy....
Of course nothing wrong against it...as even the polarisation of the first valve is a litle "out of tune" with the 22 Ohm...put it as in the schematic!
But when i say:
"You must use the 562 ohms resistor if the lower is 22...!!!" i think that was clear that will be only in case that you want keep the 22 in the lower position...
Guess!...Is my favorit tube (specialy in the NOS Mullard incarnation!!)
Regards
Of course nothing wrong against it...as even the polarisation of the first valve is a litle "out of tune" with the 22 Ohm...put it as in the schematic!
But when i say:
"You must use the 562 ohms resistor if the lower is 22...!!!" i think that was clear that will be only in case that you want keep the 22 in the lower position...
Guess!...Is my favorit tube (specialy in the NOS Mullard incarnation!!)
Regards
Frank
I think I will stay with the KT88 and 6550's for primary tubes. I would be interested in how the EL34's would sound. I just happened to have a few. LOL
I thought you might have a different front end for me to try since you are so knowledgeable on the Quicksilvers.
slowmotion
Do you still have your 8417's? What ideas/comments/help could you lend me since you have also own/owned the Quickey?
Tube_Dude
Thanks so much for the help. I would be interested in any ideas if you would care to share them.
Joe
I think I will stay with the KT88 and 6550's for primary tubes. I would be interested in how the EL34's would sound. I just happened to have a few. LOL
I thought you might have a different front end for me to try since you are so knowledgeable on the Quicksilvers.
slowmotion
Do you still have your 8417's? What ideas/comments/help could you lend me since you have also own/owned the Quickey?
Tube_Dude
Thanks so much for the help. I would be interested in any ideas if you would care to share them.
Joe
QUICK MODS.
Hi,
Thanks for the compliment...
The front end I like best is the one on the schematic you posted, get good tubes there and it will reward you with a different sound.
It is pretty much a matter of taste really, I always liked the 5751s (unless RIAA correction depends on the parameters of the 12AX7s).
But don't let the differences drive you crazy, try to enjoy the music.
You could fiddle with upgrading passives components, a bit of silver wire and such if you must.
Cheers,
Hi,
Thanks for the compliment...
The front end I like best is the one on the schematic you posted, get good tubes there and it will reward you with a different sound.
It is pretty much a matter of taste really, I always liked the 5751s (unless RIAA correction depends on the parameters of the 12AX7s).
But don't let the differences drive you crazy, try to enjoy the music.
You could fiddle with upgrading passives components, a bit of silver wire and such if you must.
Cheers,
Tube_Dude design ideas....
What i will do if you amp was mine (read this as just my opinion)!
-First a volume pot at the input(gone is the noise and distortion of the preamp)!
-A 2.2K resistor in the wiper and the grid of the first tube (grid stopper) !
- A 100uF capacitor across the 820 OHms resistor in the cathode of the first tube
-In the phase spliter i don't do anything as it was my favorite!
-And finally i will put the output stage in pentode operation (as i don't like de sound of ultralinear output stage)
-And yes i will drop in the EL34
Then i relaxed and listen....
Cheers
What i will do if you amp was mine (read this as just my opinion)!
-First a volume pot at the input(gone is the noise and distortion of the preamp)!
-A 2.2K resistor in the wiper and the grid of the first tube (grid stopper) !
- A 100uF capacitor across the 820 OHms resistor in the cathode of the first tube
-In the phase spliter i don't do anything as it was my favorite!
-And finally i will put the output stage in pentode operation (as i don't like de sound of ultralinear output stage)
-And yes i will drop in the EL34
Then i relaxed and listen....
Cheers
A MATTER OF TASTE, I SAID?
Bom dia,
Think hard on this...it just kills microdynamics, if you don't need them don't use them.
If you need them, use the smallest possible value.
I wouldn't do that either, the ECC83 has plenty of gain already, Zo may be on the high side but I still prefer it as is.It reduces distortion without the slow trnsient response of the bypass cap and you may overload the next stage.
You could drill extra holes in the chassis, gone is the resale value though.
Other than the US 6CA7, I find the European EL34 rather anemic in the bass department.
Cheers,
Bom dia,
Think hard on this...it just kills microdynamics, if you don't need them don't use them.
If you need them, use the smallest possible value.
I wouldn't do that either, the ECC83 has plenty of gain already, Zo may be on the high side but I still prefer it as is.It reduces distortion without the slow trnsient response of the bypass cap and you may overload the next stage.
You could drill extra holes in the chassis, gone is the resale value though.
Other than the US 6CA7, I find the European EL34 rather anemic in the bass department.
Cheers,
Bonne nuit!
I suposed that is clear that with a pot at the input... the grid stoper is a must...if not...oscilation!!!!!!
Without a pot...can be!
That really i don´t understand...actualy the capacitor reduces distortion as it increased the open loop gain...
Take a look at the Mullard 20 and others...
But who cares about resale value ...for me the quest is for better sound...(call me fundamentalist...)hehehehe....
I have warned you that they are my prefered output tubes (i like also the 7591A)...
Anemic in the bass department?...ad a sub woffer...
I suposed that is clear that with a pot at the input... the grid stoper is a must...if not...oscilation!!!!!!
Without a pot...can be!
That really i don´t understand...actualy the capacitor reduces distortion as it increased the open loop gain...
Take a look at the Mullard 20 and others...
But who cares about resale value ...for me the quest is for better sound...(call me fundamentalist...)hehehehe....
I have warned you that they are my prefered output tubes (i like also the 7591A)...
Anemic in the bass department?...ad a sub woffer...
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.