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Bijou All Tube Futterman Headphone Amplifier - Page 79

post #1171 of 3976
8/29/08 at 7:35am
willisv
Thanks for your input
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post #1172 of 3976
8/29/08 at 10:33am
Thread Starter 
not sure if this is a good sign or a sign that I need to step out for a while but here is the original r-core discussion. scroll down to PRR's post..dB
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post #1173 of 3976
8/29/08 at 8:56pm
Thank you dBel84, it is very helpful.
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post #1174 of 3976
8/31/08 at 12:13am
Pabbi, I will be finished soldering/constructing the unbalanced to balanced converter tonight. I have a boat trip on Rollins Lake tomorrow, which is almost a 2 hour drive, but then tomorrow night it will be time to feed my unbalanced source through the converter and into your amp to get things moving.
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post #1175 of 3976
8/31/08 at 12:56am
Ron, enjoy your weekend - we all need a rest. Thanks for the update, and the above and beyond - still enjoying the heck out of our previous 'collaboration'...
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post #1176 of 3976
9/2/08 at 4:43pm
started stuffing....

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post #1177 of 3976
9/2/08 at 8:01pm
Quote:
Can you supply a wiring diagram for how you wired amperex 8416 and r-core (R0080-036)?
The R-core is the best transformer option in my opinion, I liked it so much I bought two!

You have to be careful though, as the heater supply is not floating, so when changing to 12.6V heaters, you have to keep one leg connected to the HV supply. Here's a diagram by runeight explaining the setup:



Use this in conjunction with PRR's description.
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post #1178 of 3976
9/3/08 at 2:44am
After reading the specs on the R-core's quiet characteristic in close quarters, I tend to agree that it is a good choice.

Well, Pabbi I am going to be firing up the amp tomorrow. Lost some time do to the holiday. I'm a little bit beat, after risking my crazy brother-in-laws sea-doo ride. It is a small speed boat, and he likes to jump wakes, and as a passenger I took a beating. ;-) Edit: if the converter works well, I'll send it with the amp so that you can run single ended sources through your amp as well as your usual balanced Azur/phono gear.
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post #1179 of 3976
9/3/08 at 3:23am
Quote:
Originally Posted by Mazuki View Post
The R-core is the best transformer option in my opinion, I liked it so much I bought two!

You have to be careful though, as the heater supply is not floating, so when changing to 12.6V heaters, you have to keep one leg connected to the HV supply. Here's a diagram by runeight explaining the setup:



Use this in conjunction with PRR's description.
one leg connected to HV supply? could you explain that in more detail to me.
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post #1180 of 3976
9/3/08 at 3:42pm
The heater secondaries are wired so that one of them supplies 6.3V. This includes the rectifier. This secondary is wired to pins 3 & 4 of the terminal block.

Pin 3 is supplied with the DC heater bias from the internal PS circuitry. Thus, the other secondary is wired in series with the first secondary to make 12.6V while one of its leads is also connected to pin 3 of the terminal block. This ensures that both secondaries see the heater bias.
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post #1181 of 3976
9/3/08 at 4:10pm
Quote:
Originally Posted by runeight View Post

Pin 3 is supplied with the DC heater bias from the internal PS circuitry. Thus, the other secondary is wired in series with the first secondary to make 12.6V while one of its leads is also connected to pin 3 of the terminal block. This ensures that both secondaries see the heater bias.
Thats the bit that helps, Cheers.
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post #1182 of 3976
9/3/08 at 6:19pm
From the sounds I'm hearing, I'm gonna need at least one new 6N6P soon (wierd intermittent crackling sounds, switched 6N6P's, sound followed tube).
There doesn't seem to be any shortage of them on ebay, so I was wondering
if anyone here has had dealings with any of the ebay dealers (Ukraine, etc.), or if there's a better place to find them? Thanks.
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post #1183 of 3976
9/4/08 at 8:48am
So, I got my new mosfets and ez81 in and am sitting at 250v stable now. Got some new 6dj8's too, but I had a question before I put my new tubes in...

EDIT: Revised. Found this pretty good tutorial on how to implement a standby switch, but I still wanted to clear a few things up.

Does the Bijou need a standby switch? The article mentions that amps with a controlled warm up rectifier don't need it, and since I'm unfamiliar with amp design features I can't tell if the Bijou has this or not.

It also says that a 250VAC 1A in the B+ line will suffice for a standby switch, will this be heavy enough duty for the Bijou? I was planning on using atleast a 6A 250VAC switch like this partsxpress rocker, but I don't know if VAC and VDC are equivalent or what.
Can anyone help clarify? Thank you.
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post #1184 of 3976
9/4/08 at 4:13pm
chobint, the main reason for the tube rectifier is for the slow start on the PS. If everything is working normally you should not need a B+ standby switch. I don't have one and Bijou has been running ok for several years now.
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post #1185 of 3976
9/4/08 at 8:39pm
cool, I was unaware of said feature. One less thing for me to mess up :P
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