[vlb]

If someone is looking för big filmcaps in uk...
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=260611560663&ssPageName=STRK:MEWNX:IT

 

[vlb]

A lite preview of my build.
http://img689.imageshack.us/img689/5168/20100616838.jpg
 

 

[nattonrice]

Woah snap is that dual mono?
Looks very slick!

 

[IloveHP]

Hello! I'm new here, from SE Asia.
 
I have a chance to try out the Bijou amp build by my friend and its certainly blow my MKIII away.
 
I have scrapped enough components to build the Bijou but to keep cost low, I decided to build a Point-to-Point wiring version of it.
 
I was wondering what is the correct rating of the 10K pot used to adjust voltage on the Power Supply section, I have a number of 10K but they are all rated at .5W to 1W with a max AC rating of 100V. Is it safe to use these particulars batch of Pot?
 
BTW, if you guy need help getting any components from Singapore, I can help out.
 

 

[vlb]

Yes it´s going to be a dual mono. I haven´t finished the second PS yet so im using it as a "standard" bijou. I think the second PS will make a big difference, I cant get more than 242V nice dc from my PS with regals mods. 

 

[gabriel-dan]

Hi everyone,
I bought a R-core R80-36 for a Bijou I'm building. The problem is I'm getting 6.99v for the heater. Is that voltage too high? I was thinking on adding resistors to drop the voltage a bit. Has anyone using R-core R80-36 experienced the same high volts for the heater? What wattage resistor should I use?
 
One more thing, looking at the wiring diagram from the bijou site, the power supply PCB terminal block shows 6.3v x2. Please correct me if I am wrong, is that two times 6.3v with respect to ground(chassis) or across the terminal?
Thanks in advance

 

[adamus]

i found the heater v a bit hot too.
 
to work out the resistor value and wattage, you need to use ohms law
 
Vdrop = I heater X Rdrop
Vdrop = 0.6V
Iheater = sum of heater currents
work out R drop from there.
 
Power = V I
 
leave a margin of at least 50% for the resistor wattage, some prefer more.
 
the two 6.3v are 6.3v wth respect to eachother

 

[gabriel-dan]

Thanks for the info Adamus, much appreciated.

 

[Ant1Xr1st]

Some updates of my DC coupled Bijou project. I think it's going to be a final version. The only one thing i want to try is to use a parallel 6N6P (ECC99) I haven't find any notice about it in this huge thread.

 

[ujamerstand]

Interesting. So you added a dual power supply and separated the sections to accommodate the servo. I'm not an engineer, so I could be wrong, but wouldn't the difference in ground reference be a problem? And I see you eliminated the global feedback loop, any reason to the change? I hope to see more explanation to the changes applied.
 
Edit: Actually, never mind about the ground reference problem. I forgot that the phase splitter cathode returns to output instead of ground.

 

[Ant1Xr1st]

ujamerstand, the gain & phase splitter part is't dc coupled with buffer stage. there will be no problems with ground. we just will need a higher voltage caps (C107)
i just don't use the feedback because of my high impedance headphones, but i think it should work

 

[ujamerstand]

Ah, right, you got 0.1u caps in there. Plus if anyone want global feedback in there for low-z cans should be easy enough.

 

[pabbi1]

Quote:

Some updates of my DC coupled Bijou project. I think it's going to be a final version. The only one thing i want to try is to use a parallel 6N6P (ECC99) I haven't find any notice about it in this huge thread.

 
I used 6n1p / 6n6p in my Bijou (no idea who has it now), but I did find it took several hundred hours to burn the static out of the tubes. I'd suggest 6n23-ev instead, as those should be almost as cheap for you there, and you _can_ use 6h30p... have a look at CA tweaks page .

 

[clifwst]

New member here, 
 
I ordered a kit from Glass Jar Audio this week and collecting parts for an enclosure.
 
I have a piece of aluminum diamond plate I want to use for a top plate.
 
I have a question, can the amphead heater mod and cap multiplier mod be done on the same power section?
 
If so would you remove the R9, instead of changing it's value like it shows here.
 
Thanks.

 

[TimJo]

Welcome to Head-Fi and the wonderful world of Cavalli amps.

 
Yes I believe that would be the case since the goal of amphead's mod was to isolate the heater wiring from B+, but maybe someone more experienced than me can confirm as well...
 
Quote:

New member here, 
 
I ordered a kit from Glass Jar Audio this week and collecting parts for an enclosure.
 
I have a piece of aluminum diamond plate I want to use for a top plate.
 
I have a question, can the amphead heater mod and cap multiplier mod be done on the same power section?
 
If so would you remove the R9, instead of changing it's value like it shows here.
 
Thanks.