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Old 8th February 2003, 04:46 AM   #21
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Hi,

Cool looking preamp. Where did you get the PCB for the rectifier?

ck
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Old 8th February 2003, 05:58 AM   #22
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Quote:
Originally posted by Ciscokid
Hi,

Cool looking preamp. Where did you get the PCB for the rectifier?

ck

That came with the bridge. It is a Teac TP-S47-T and was something I just had laying around. It made layout simpliar that trying to use the supplied individual diodes. Worked well and it's quiet.
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Old 8th February 2003, 09:52 AM   #23
dhaen is offline dhaen  Europe
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Default Variable mu valves

Quote:
Originally posted by EC8010


I'm not quite sure what the variable-mu ECC189 is doing in your list,
Nor am I, but I've seen it (and others) in use.

Remembering the way these valves were used:
The RF amp variable mu valves were only required to adjust the gain by a few dB or so, to avoid overload.
The main gain control was normally done in the first IF stage, by an EF183.
My point is, that it's probably a better choice than an EF183.

Also, I remember that before custom var-mu's, AGC was applied to valves like EF80's.

Cheers,
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Old 8th February 2003, 11:39 PM   #24
moe29 is offline moe29  United States
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beyond the bickering....

that is one fab looking foreplay! Verrrry nice.

...puts mine to shame. The top plate looks very
cooly minimalistic... just two glowing tubes.

makes me want to redo my Foreplay.


---------------------
don't get sentimental
it only ends up drivel
-------------------
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Old 8th February 2003, 11:59 PM   #25
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Excellent look and wiring work! You should be really proud.
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Old 9th February 2003, 12:17 AM   #26
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Default FU2.

Hi,

Quote:
FU! I love 12AU7
And am I the only one to spot the pair of clear top RCA 12AU7As or what?

No,I don't want do talk about zirconium getters...

Cheers,
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Old 9th February 2003, 12:58 AM   #27
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You mean like these.
Attached Images
File Type: jpg 12au7.jpg (58.6 KB, 290 views)
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Old 9th February 2003, 01:00 AM   #28
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For what it's worth, a reply from another board:

The CV 4003 and the ECC82 are not the same. The ECC was manufactured specifically for audio application. This doesn't mean the CV 4003 is crap, just not manufactured to the same exacting standards that the ECC series. The CV 4003 is a "box plate" whereas the ECC series used "long plate" construction. The CV 491 from the late 50's is much better preferred to the CV 4003 and has "long plate" construction. The CV 4003 were manufactured from the early 60's into the 70's, the ECC began production in the 50's.
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Old 9th February 2003, 01:30 AM   #29
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Default 12AU7A

Hi,

Quote:
You mean like these.
Yes,Sir..that's the ones.

Quote:
The CV 4003 and the ECC82 are not the same.
I've never been too impressed with the Mullard range of ECC's boxed,long plate (and that's Philips for you and me).

Numero uno to me has always been TFK,than Philips and all its' subsidiaries.
If you need a list of those subsidiaries,I can provide it but it really goes global beyond anyone's imagination so expect an arm long of brands.

Cheers,
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Old 9th February 2003, 02:44 AM   #30
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Whoops...double posted...

Tim
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