Bijou Headphone Amplifier build

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JackOfAll
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#1 Bijou Headphone Amplifier build

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davebms
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#2 bijou

Post by davebms »

well iwas thinking of useing a r core R0080-036EU from diyhifi store

will it do the job (ive only just got the kit out off the box) :roll:

dave
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r core transformer  biju.jpg
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Greg
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#3

Post by Greg »

Hi Clive,

Very many thanks for your observations and I take note of what you have said. No doubt, once I start work on the kit my questions will follow and I much appreciate your willingness to be involved. The iron is waiting and watching. So am I :D

Regards,

Greg
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colin.hepburn
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#4

Post by colin.hepburn »

Yep just got off the phone with Clive Very nice chap to talk to and very helpfully :) and has put a lot of my doubts and inabilities to built an try things to rest giving me the confidence to have a go very much appreciated
Thanks Clive 8)
Time to walk the dog again :)
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davebms
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#5

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[quote="Time to walk the dog again

don't have a dog :cry: but yes thanks for the info, work load very high at the moment so build will be slow

dave
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JackOfAll
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#6

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JackOfAll
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#7

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davebms
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#8

Post by davebms »

JackOfAll wrote:Dave,

Yes, that R-core is fine.

Thinking about filament current.....
1x EZ81 @ 1A, 2x 6N6P @ 0.8A, 2x ECC88 @ 0.3A = 3.2A.

Looking at the 6.3V windings..... So you have 2x 3A windings. I'm not quite sure what the deal is with one of them being connected to the PSU board and then the series connection (12.6V) going to somewhere off-board. I'll assume that the 12.6V is being used to supply 2x ECC99's.

I'd be inclined to put the 2x 6.3V windings in parallel for a single 6.3V @ 6A winding, rectify for the signal tubes and leave the EZ81 running on AC.

Having 6A to play with gives you a little more flexibility over the 3.5A of a Hammond 370DAX, when you need to derate by x1.8 for AC->DC. You'll need ~5A if you go that way, so I like the fact that you have 6A to play with.
THANK YOU that's the tranny sorted :wink: (i was not going to wire it as the in the photo i just used it to convey what i had in mind) ive seen modules for heater supplys but poss a diode bridge would do

and you recommend a ccs for r3 i now what one is, but no idea how to implement it ! still that for future tweaks

dave
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JackOfAll
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#9

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Nick
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#10

Post by Nick »

At 0.75W a IXCP10M45 will be at about 80C, I would suggest a clip on heatsink or bit of Ali at least.
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Dave the bass
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#11

Post by Dave the bass »

Nick wrote:At 0.75W a IXCP10M45 will be at about 80C, I would suggest a clip on heatsink or bit of Ali at least.
Does our-Ali know about this? :shock:

DTB
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Ali Tait
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#12

Post by Ali Tait »

I like all my bits just where they are thanks! :D
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Dave the bass
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#13

Post by Dave the bass »

Ali Tait wrote:I like all my bits just where they are thanks! :D
So do we! *strokes spikey hair* :)

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Ali Tait
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#14

Post by Ali Tait »

Thanks poppet. :D
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JackOfAll
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#15

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