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Bijou All Tube Futterman Headphone Amplifier - Page 139

post #2071 of 3981
12/15/08 at 9:12pm
Whitelabrat, welcome to the Bijou build thread! Looking forward to pics of your progress.
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post #2072 of 3981
12/15/08 at 9:26pm
Thanks Ferrari. I just noticed the text section of the parts lists that has more detail about parts selection. Whoops!

I have a tendency to put all my effort into parts, and then run out of money for a good chassis. I'm looking at an old PA that could be a doner.
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post #2073 of 3981
12/16/08 at 3:01pm
Quote:
Originally Posted by whitelabrat View Post
I'm prepping to build a Bijou, but I'm stumped on some of the parts from the BOM. For example, the heat sink. I'll likely source most of the parts from Mouser. Help?

I've already got an Allied 6K65VG power transformer that is 540vct at 120ma. I've also got a pair of 100uF Solen's and a pair of gigantic ASC 600uF caps that may be used on the outputs. Whatever doesn't get used on the HA2 clone I'm building too.
A Wheatfield HA-2 clone?

I think the NABU case is calling you...
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post #2074 of 3981
12/16/08 at 6:25pm
Yes the Wheatfield HA2:

diyAudio Forums - Cheapfield project - Page 1

I could be really cheap and use a cakepan. Just be sure to wash it first.

I've just about got a BOM together that I'll post once I've converted it to a useful format.
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post #2075 of 3981
12/16/08 at 8:07pm
Wow, my Tesla gold pin E88CC's from ebay arrived today... what a difference from the noisy Philips and E-H tubes! Sound is amazing. Highly recommended for $40/pr shipped.
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post #2076 of 3981
12/16/08 at 8:08pm
I owned a HA-2 and HA-1 for several years... loved those amps... but, our wanderlust took them all away from us... <sigh>.

Knowing where you are with that, the Bijou is a different presentation, and certainly a worthwhile build. In fact, I chose Bijou over Menace (balanced HA-2 was my real aim), so you are in for a treat.
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post #2077 of 3981
12/16/08 at 11:35pm
i'm going to purchase 38' of 28 awg solid-silver wire from Partsconnexion tomorrow for hook-up wiring, a set of ICs, and a headphone re-cable for my HD650. will this thin gauge wire be able to handle the Phoenix screws?

i'm also going to order some Vishay Nudes for the I/O resistors on my attenuator.
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post #2078 of 3981
12/17/08 at 3:59pm
i can't believe i just spent $13.91 a piece for 4 "nude" Vishay 100K resistors from texascomponents.com. ouch...i hope they live up to the hype. cotton wrapped solid silver wire ordered as well.

the Balanced Bijou continues to impress. no FOTM at chez fishski.
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post #2079 of 3981
12/18/08 at 4:35am
Sounds like you are going deep into some Bijou voodooland territory, and I will be interested in the results. ;-)

Well, I have attached the front panel to the side panels. When the back panel is attached, I will carefully measure for the bottom panel. Edit: some may remember way back in this thread, when I started working on the logo, that I was going to create a backlit badge. This was the reason that I didn't need to use line art. Not that this will be the approach taken by those doing FPE logos, which will be equally stunning.
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post #2080 of 3981
12/18/08 at 11:21am
Quote:
Originally Posted by regal View Post
To use the 6H30's I am assuming you are using a separate filament transformer, because the 6H30's are using at least an amp more current, or is the standard transformer good enough ?

Can I sub a 6H30 in the input without adding a separate heater transformer or is the 270DAX good enough. The reason I ask is that I haven't known Hammond to even be remotely close to their heater specs. They're usually significantly under rated.
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post #2081 of 3981
12/18/08 at 2:29pm
I'd suck it and see. if you see a voltage drop, or the tranformer hums/ gets hot then there is problem.
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post #2082 of 3981
12/19/08 at 4:28pm
EZ80, EZ81... all pricey rectifiers it seems. What if I just used a pair of hexafreds instead? I'll probably need heftier voltage dropping resistors, but should solve any current limitations. Just wondering.
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post #2083 of 3981
12/19/08 at 6:49pm
blowing 3.15A fuses shortly after power-up. one of my DAZ 370 transfos gets too hot to touch, the other feels normal. foul electronics smell in the air. any ideas on where to start trouble-shooting?
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post #2084 of 3981
12/19/08 at 7:03pm
fishski13, is your rectifier tube OK? I'd check there first. I'd also check any regulators in case of a short.

That's where I'd start.

I've had trouble with Hammond transformers where they can have a very high voltage surge on power up. Dropping a CL-90 or CL-110 Thermistor on the primaries may help soften the blow to the rectifier tube.
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post #2085 of 3981
12/19/08 at 7:35pm
yes, the EZ81 is toast. unfortunately, i also have continuity between the HV 260AC secondary and 6.3AC heaters and CT with the EZ81 removed from the tube socket. are my regulators (Q1,Q2) toast as well? what about the TIP50 on my multiplier PS add-on? how the hell did this spontaneously happen?

edit: can you accurately test the regulators in circuit?
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