Hi,
Yeah, sounds quite plausible. A bit much for most uses really
Cheers, 😉
Found this:
http://www.diyaudio.com/forums/tubes-valves/190931-lowering-gain-franks-6sn7-preamp.html
Yeah, sounds quite plausible. A bit much for most uses really
Cheers, 😉
Found this:
http://www.diyaudio.com/forums/tubes-valves/190931-lowering-gain-franks-6sn7-preamp.html
Frank I will make the 2 tubes for stereo with 20dBs gain, do you know how much current draws both channels, I ask because I will use SSHV2?
Felipe
Felipe
Hi,
I don't really remember but it's easily calculated, I guesstimate not much more than 15 mA per channel just by looking at the values.
All my designs are dual mono to the extreme and usually regulated using valved series regulators. Even as far as having a per stage regulator.
The aim of all these designs is to reproduce the musical experience so you can enjoy it and stop wondering about the system.
Cheers, 🙂
I don't really remember but it's easily calculated, I guesstimate not much more than 15 mA per channel just by looking at the values.
All my designs are dual mono to the extreme and usually regulated using valved series regulators. Even as far as having a per stage regulator.
The aim of all these designs is to reproduce the musical experience so you can enjoy it and stop wondering about the system.
Cheers, 🙂
SSHV2 have CCS, It's necessary the 47K plate resistors? If not wich plate have I to set the SSHV2?
Umm, yes the 47K resistors are necessary, they are the load resistance for the common cathode amplifier stages on each channel.
Frank, do you have a power supply schematic for the 6sn7 preamp? I was going to use the one previously posted in this thread for the 12bh7 line stage but I see the output voltage is very different (305vs250) and was wondering what changes I'd have to make to adapt the supply.
Also, I have only one el86, but many el84 tubes, is this a possible substitution?
Thanks in advance.
Also, I have only one el86, but many el84 tubes, is this a possible substitution?
Thanks in advance.
Hi,
There are numerous possibilities for the power supply but you could use one of these per channel:
Cheers, 😉
There are numerous possibilities for the power supply but you could use one of these per channel:
Cheers, 😉
Thank you so much frank, I will see if I can find some ecl86 tubes in my stash, would I be able to replace this tube with say an el84 and a 6c4? I plan on maybe running two of these setups as true mono power supplies like you advised for the other linestage. Also, how much current will this circuit deliver? I'm considering adapting it into my current el84 power amp that is currently on a standard pie filter unregulated supply.
Maybe a more suitable question would be: do you have a tube regulated power supply schematic that might be able to deliver 50-100ma @ 250-350v range?
The design of these supplies is still far above my skill level, thank you in advance for your help.
Maybe a more suitable question would be: do you have a tube regulated power supply schematic that might be able to deliver 50-100ma @ 250-350v range?
The design of these supplies is still far above my skill level, thank you in advance for your help.
Hi,
It is an ECL85/6GV8 actually, not an ECL86
The former is still around and not much sought after.
Unfortunately I don't.
Cheers, 😉
It is an ECL85/6GV8 actually, not an ECL86
The former is still around and not much sought after.
Unfortunately I don't.
Cheers, 😉
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Both el86 and ecl85 are proving to be very difficult to find locally for me. Is there a way to adapt design a regulator around an el84 pass tube? It would seem much easier to source....
Well, yes And no Frank. Is there something absolutely necessary about the el86 or ecl85 that differs from the el84 to a degree that the schematic couldn't be amended to compensate? I can walk to guitar center and buy el84, while finding those other tubes requires online ordering and there's is very little new production tubes to pick from.
I just think that ultimately using more readily obtainable tubes would be a major improvement to the design.
I realize that this might only be my wish, as of such I will try to understand and reverse engineer your schematic on my own. If I manage to simulate something passable using the el84 I will post it here for you to review. Thanks again for your help Frank.
Hi,
Well yes, there are various reasons why one would use these types of valves but sure enough one could make a series reg with an EL84/6BQ5 and a ECC83 as an error amp as well.
But, you'd still want the voltage reference as well. No idea if electric guitar shops carry these.
Unless of course you're going to replace it with a stack of zener diodes that is.
Cheers, 😉
Well yes, there are various reasons why one would use these types of valves but sure enough one could make a series reg with an EL84/6BQ5 and a ECC83 as an error amp as well.
But, you'd still want the voltage reference as well. No idea if electric guitar shops carry these.
Unless of course you're going to replace it with a stack of zener diodes that is.
Cheers, 😉
Zzzzzzzeners are not for me, also I luckily have many 5651 and 0a2 tubes at my disposal. Those seem to be easy to find as many devices used them. Local electronics shops here in town have old tube surplus. Anything audio output related has been taken long ago, but voltage regulators are still a dime a dozen..