2A3 pre-amp

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Paul Barker
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#361

Post by Paul Barker »

Dave the bass wrote:The only time Cyanide is required Paul is when our-Phil brings out one of his fave CD's from his 'music' collection....

Heheheheheheheheheheheheh (etc). :-)

DTB
Phil play that stuff and I come round with my Val Cardigan Record.



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Last edited by Paul Barker on Tue Jan 01, 2013 10:59 am, edited 1 time in total.
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pre65
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#362

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Actually, one LP I like quite a lot is Val sings country. :lol:
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Paul Barker
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#363

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pre65 wrote:Actually, one LP I like quite a lot is Val sings country. :lol:
Which one of his mother's cardigan's was he wearing on that one?
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#364

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Paul Barker wrote:
pre65 wrote:Actually, one LP I like quite a lot is Val sings country. :lol:
Which one of his mother's cardigan's was he wearing on that one?
For some strange reason he's wearing a red shirt. :?

Ask Dave about my Triumph pullover. :lol: :lol:
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#365

Post by pre65 »

The Clarity cap 0.68uf has now been installed in place of the Russian 4uf. It was a bit more complicated than just soldering them in but not too much trouble.

Can't say I noticed an instantaneous difference but I'll see how they progress during the day.
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Paul Barker
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#366

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pre65 wrote: Ask Dave about my Triumph pullover. :lol: :lol:

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Dave the bass
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#367

Post by Dave the bass »

Nah Paul, more like....

Image

:lol:

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#368

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Now, come on young Mr Bass,

what's wrong with a bit of colour ?

The colours are from the Triumph model range the year the sweater was made.

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Nick
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#369

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Just to mention 2a3 preamps again :-)

Just replaced the pair of 2a3's with a single 6080, 1k9 in its cathode everything else the same. Its really good. And silent.
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#370

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Nick wrote:Just to mention 2a3 preamps again :-)

Just replaced the pair of 2a3's with a single 6080, 1k9 in its cathode everything else the same. Its really good. And silent.
That's great. :D

Somewhere or other I have an odd pair of 6AS7GA , no idea if they work, but one might. :wink:

I thought 6080 and 6AS7ga were much the same but data sheets don't list them as alternatives.

Some e-bay sellers give both numbers. :? :?

EDIT. I found a GE data sheet and they are preferred substitutes. :)
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#371

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I had actually made a start on the new pre, but I have stopped for a while to think about this new development.

I have checked my resistor stock and the nearest I've got is two 5W 1K8 Kiwame. Power wise it's just under double dissipation.

At 35ma that's about another 3v on the cathode. :?:
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#372

Post by pre65 »

Thinking of practical things.

1) Can my 6.3v AC supply do another 2.5A ? Total would be 3.4A, so probably.

2) The 6.3v AC supply has raised potential, will that matter ? The data sheet for 6AS7ga says the max difference is 300v, so that should be OK as well.
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#373

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pre65 wrote:I had actually made a start on the new pre, but I have stopped for a while to think about this new development.

I have checked my resistor stock and the nearest I've got is two 5W 1K8 Kiwame. Power wise it's just under double dissipation.

At 35ma that's about another 3v on the cathode. :?:
Close enough for jazz
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#374

Post by Cressy Snr »

Nick wrote:Just to mention 2a3 preamps again :-)

Just replaced the pair of 2a3's with a single 6080, 1k9 in its cathode everything else the same. Its really good. And silent.
I had one of those once. It was superb.
I then converted it to use a 6336A.
That was even better. :D

I called it "A very Silly Preamp"
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#375

Post by Nick »

SteveTheShadow wrote:
Nick wrote:Just to mention 2a3 preamps again :-)

Just replaced the pair of 2a3's with a single 6080, 1k9 in its cathode everything else the same. Its really good. And silent.
I had one of those once. It was superb.
I then converted it to use a 6336A.
That was even better. :D

I called it "A very Silly Preamp"
Ahh, but you didnt use el84's as anode loads, just as well you didnt. otherwise I would have to sue you for stealing my intellectual property. What do you mean you did it before? What has that got to do with it? :-)
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