FINISHED PMEQP-1A3 in API500 format

[safe as milk]

hi
just finished up a few of these modules today & thought it's been a while since i
posted any of my 'hack work'...
a big thankyou to ian for the design of the filters, supplying the boards
& answering lots of really silly questions
and a big thankyou to jeff steiger for the 312 boards which i then proceeded
to hack to pieces!

i used bbc input/output iron, melcor op amps from fabio way back when...
and hacked the card to be an api325 line amp.

i'll dig out the front panel file & try to post to.

pics...

 

[safe as milk]

pic2

 

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pic3

 

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pic4

 

[gemini86]

Wow!  Great work!

 

[jensenmann]

heck, yeah, that´s the spirit of DIY. Great work!

 

[okgb]

Yep , good D.I.Y. spirit & craftsmanship , Bravo

 

[ruffrecords]

i used bbc input/output iron,

Are those the same BBC transformers you kindly sent me some samples of?

Cheers

ian

 

[creal]

very nice job man

 

[safe as milk]

wow, i didn't expect such a great response.
thankyou very much guys.

ian-if i sent you some yellow square ones to test then
you have in's & the out's...thanks again for inspiring these.

;D

 

[etheory]

This is great, well done!

 

[MatthisD]

Great layout, nice and spacious!

 

[mrclunk]

very nice!

 

[ruffrecords]

ian-if i sent you some yellow square ones to test then
you have in's & the out's...thanks again for inspiring these.

;D

You sent me a couple of the square yellow ones but also some round ones with flying leads that look rather like the other transformer I can see on your PCB or is that something else entirely?

Cheers

Ian

 

[safe as milk]

hi ian
yeah the yellow squares are bbc al94 1:1 outputs
and the others are bbc ll88asc 1:1 in or outs
we have a 60's pye console here with those as direct outputs
that sounds great.

i hope you find a happy valve home for them...

thanks as ever
justin

 

[ruffrecords]

hi ian
yeah the yellow squares are bbc al94 1:1 outputs
and the others are bbc ll88asc 1:1 in or outs
we have a 60's pye console here with those as direct outputs
that sounds great.

i hope you find a happy valve home for them...

thanks as ever
justin

I recently treated myself to a decent inductance meter and spent a pleasant morning measuring the characteristics of all the transformers I could lay my hands on. The results were quite interesting and, when I have measured a couple more transformers that I expect to have in the next few days, I thought I would publish the results here. Needless to say, the BBC transformers are well specified.

Cheers

Ian

 

[dmp]

I recently treated myself to a decent inductance meter and spent a pleasant morning measuring the characteristics of all the transformers I could lay my hands on. The results were quite interesting and, when I have measured a couple more transformers that I expect to have in the next few days, I thought I would publish the results here.

I would love to see that!  How much does one have to spend on a decent inductance meter? I've looked on ebay and it seems most (of the cheap ones) don't go beyond 20 H. Too low for most transformers, yes?

 

[ruffrecords]

I recently treated myself to a decent inductance meter and spent a pleasant morning measuring the characteristics of all the transformers I could lay my hands on. The results were quite interesting and, when I have measured a couple more transformers that I expect to have in the next few days, I thought I would publish the results here.

I would love to see that!  How much does one have to spend on a decent inductance meter? I've looked on ebay and it seems most (of the cheap ones) don't go beyond 20 H. Too low for most transformers, yes?

They are not cheap. I got one made by Agilent which it cost me nearly 200GBP and there plenty of more expensive ones to choose from. It goes up to 200 Henries.

Cheers

Ian