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Bijou All Tube Futterman Headphone Amplifier - Page 78

post #1156 of 3977
8/26/08 at 3:29pm
IIRC, the heater secondaries are 3A? I think you'll be ok here too. But as we know the heater voltages can vary. And we'll have to see if you can use the EZ80 or need to try the EZ81. This choice affects the heater current draw.

It is possible to put small resistors in the heater circuit if that turns out to be a problem.
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post #1157 of 3977
8/26/08 at 3:37pm
cheers, considering the 370dax will cost me $100, and then i would get stung with customs i think i will go for the r core, save me at least $50, probably more.
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post #1158 of 3977
8/26/08 at 5:52pm
Quote:
Originally Posted by runeight View Post
It's like tube rolling. How can two tubes of the same type with exactly the same electrode construction and spacings sound different?? But for some reason we think that they do.

So, I don't know . . .
Runeight, Regal, thank you! That's an interesting discussion. I'm not sure that I'm ready to experiment with different capacitors but will keep that in mind.
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post #1159 of 3977
8/27/08 at 5:10pm
Quote:
Originally Posted by GeWa View Post
Hey Ferrari, where did you get those from?

Regards
I got those 6N30P-DR as a present along with a couple of 6H8C (1578, metal base) from an old colleague from Ukraine
(we worked together for (AT&T)/Lucent R&D in the 1990s).
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post #1160 of 3977
8/27/08 at 5:24pm
Thread Starter 
You have good friends / colleagues , I still need to get myself a pair to try on the EHHA. From everything I read about them, they sound very good when applied correctly..dB
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post #1161 of 3977
8/28/08 at 1:54am
Quote:
Originally Posted by Ferrari View Post
I got those 6N30P-DR as a present along with a couple of 6H8C (1578, metal base) from an old colleague from Ukraine
(we worked together for (AT&T)/Lucent R&D in the 1990s).
Ukrainians Rock! Those are some great looking and probably great sounding tubes. ;-)

Pabbi, I have started building the unbalanced to balanced converter. I purchased the chips(TL074), caps, resistors and perfboard, today. Give me some time and we will get to the bottom of this problem.
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post #1162 of 3977
8/28/08 at 9:47am
Quote:
Originally Posted by amphead View Post
Ukrainians Rock! Those are some great looking and probably great sounding tubes. ;-)

Pabbi, I have started building the unbalanced to balanced converter. I purchased the chips(TL074), caps, resistors and perfboard, today. Give me some time and we will get to the bottom of this problem.
No hurries at all, but I am rather speechless at the extent to which you are having to go... pity shipping the Azur would have been a bit pricey...
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post #1163 of 3977
8/28/08 at 3:59pm
gents, as i have time and patience on my hands, what are your favourite tubes for the bijou in a reasonable price bracket.

I may aswell go for the best bang for buck from the start.

Cheers
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post #1164 of 3977
8/28/08 at 7:17pm
Quote:
Originally Posted by adamus View Post
gents, as i have time and patience on my hands, what are your favourite tubes for the bijou in a reasonable price bracket.

I may aswell go for the best bang for buck from the start.

Cheers
If you end up using the r-core for a power supply you could buy some amperex 8416 tubes for the input. They are supposed to be very similar to the expensive amperex 6922 tube at a fraction of the cost. I use them in my Bijou and they sound very nice but you have to run 12V to the heaters, this is no problem with the r-core. You should be able to find them for $15 - $20 each.
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post #1165 of 3977
8/29/08 at 4:32am
Quote:
Originally Posted by willisv View Post
If you end up using the r-core for a power supply you could buy some amperex 8416 tubes for the input. They are supposed to be very similar to the expensive amperex 6922 tube at a fraction of the cost. I use them in my Bijou and they sound very nice but you have to run 12V to the heaters, this is no problem with the r-core. You should be able to find them for $15 - $20 each.
Can you supply a wiring diagram for how you wired amperex 8416 and r-core (R0080-036)?
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post #1166 of 3977
8/29/08 at 4:38am
cheers
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post #1167 of 3977
8/29/08 at 4:39am
it is just 6dj8 with 12v heaters.
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post #1168 of 3977
8/29/08 at 5:01am
Quote:
Originally Posted by miky View Post
Can you supply a wiring diagram for how you wired amperex 8416 and r-core (R0080-036)?
There will be 4 gray secondary wires that you use for the heaters. Twist two of them together and measure the voltage between the twisted pair and each single pair then measure between the single pairs. When the voltage from the twisted pairs and each of the single pairs measures 6-7 volts and the two single pairs measure 12-14 volts then you have the right combination. I ended up with 14v on my r-core and used a 5 watt 4.7R resistor to drop the voltage down to 12V.
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post #1169 of 3977
8/29/08 at 5:14am
so, just to clarify,

You used 1 secondary to power the rectifier and output heaters, then series that with the other secondary to give the 12 v. Also, i tak it we can just ignore the CT on the heater secondaries?

Could you not have used the 5v taps to get the 12v without resistors?
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post #1170 of 3977
8/29/08 at 5:38am
Quote:
Originally Posted by adamus View Post
so, just to clarify,

You used 1 secondary to power the rectifier and output heaters, then series that with the other secondary to give the 12 v.

Could you not have used the 5v taps to get the 12v without resistors?
To be honest with you I didn't try that. Mazuki would be the one to talk to, he's the one that helped me wire up my R-core.

Edit: I just checked my R-core and there is only one 5v tap, so I'm pretty sure that won't work.
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