Is it ok to use the load resistance (RL) as R2 in a typical potential divider?
R1 = 10 ohms
RL = 6 ohms(heaters)
Vin= 18vdc
Vout = 6.3vdc
Seems to work but R1 is a 25w ali clad resistor and gets very hot.
Any better suggestions for getting 6.3v from 18v?
Potential dividers
#5
Well yes Andrew i could do that. But i'm really after a more compact solution than adding extra valves.
I suppose AC heating could be an option. Then i'd only have 12-13v to deal with, instead of 18v.
I suppose AC heating could be an option. Then i'd only have 12-13v to deal with, instead of 18v.
#6
Hi Al,
Sorry I mistook you when you said two ECC88. There's not much you can do, laws of physics and all that, the extra voltage has to go somewhere.
Hack it for now and save up for the correct bits as you go-along, that's what I try to do, use what I have to prove the concept than get the right bits when it works.
cheers,
-- Andrew
Sorry I mistook you when you said two ECC88. There's not much you can do, laws of physics and all that, the extra voltage has to go somewhere.
Hack it for now and save up for the correct bits as you go-along, that's what I try to do, use what I have to prove the concept than get the right bits when it works.
cheers,
-- Andrew
#7
I suppose that's what we all do to some extent.Hack it for now and save up for the correct bits as you go-along, that's what I try to do, use what I have to prove the concept than get the right bits when it works.
I was just trying to get away with one transformer. But if i need to use two then i will.
#8
OK so i've got the E88CCs up and running in place of the 6N6Ps.
Just about enough gain now, but some CDs are recorded at a lower level than others.
So i could do with even more gain.
Are there any tubes that could be used in place of these with a Mu higher than 30..
Need the more experienced members to tell me whats worth trying and otherwise.
Just about enough gain now, but some CDs are recorded at a lower level than others.
So i could do with even more gain.
Are there any tubes that could be used in place of these with a Mu higher than 30..
Need the more experienced members to tell me whats worth trying and otherwise.
#12
Sorry. I should have mentioned what i was doing.
Yes its a tube output stage.
See a sketch of the circuit from the link below
. This is what i have and it works fine apart from the slightly low gain. This problem only occurs with the TD1541 DAC due to its low output. Anyone with more powerful amp and very efficient speakers would find the this gain stage to be ok.
How about the possibility of adding a second stage?
http://picasaweb.google.com/aanewall/Al ... 5036024962
Yes its a tube output stage.
See a sketch of the circuit from the link below
. This is what i have and it works fine apart from the slightly low gain. This problem only occurs with the TD1541 DAC due to its low output. Anyone with more powerful amp and very efficient speakers would find the this gain stage to be ok.
How about the possibility of adding a second stage?
http://picasaweb.google.com/aanewall/Al ... 5036024962
#14
Hi Andrew.
Yes the E88CC/6n1p isn't quite enough to give decent listening levels.
The 6n6p falls well short.
Its supposed to be a SRPP circuit, and i found a very similar line stage on the web with two SRPP stages. So i though this might be the way forward.
I'd like to stick to the small double triodes if possible.
Cheers.
Yes the E88CC/6n1p isn't quite enough to give decent listening levels.
The 6n6p falls well short.
Its supposed to be a SRPP circuit, and i found a very similar line stage on the web with two SRPP stages. So i though this might be the way forward.
I'd like to stick to the small double triodes if possible.
Cheers.