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Guinever underside [message #30756]

Mon, 28 February 2005 18:28

Forty2wo
Messages: 163
Registered: May 2009

Master

More cakepan chasie work. Cheep, easy to work and you get a cherry cobbler recipe to boot...John

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I see now.... [message #30762 is a reply to message #30756]

Mon, 28 February 2005 19:55

PakProtector
Messages: 935
Registered: May 2009

Illuminati (2nd Degree)

You aren't using the second 5687. I suspect you're going to try 12B4 sooner or later aren't you? Good move IMO, but I would not throw a 5687 out ov bed either.

The regulated linestage you heard in MD now has an RK34 amplifier valve. Two anode caps, mu of 13, and an 816-ish bottle. It looks quite cool.
regards,
Douglas

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Re: I see now.... [message #30767 is a reply to message #30762]

Mon, 28 February 2005 22:01

Forty2wo
Messages: 163
Registered: May 2009

Master

Yes I set out to go with 12b4's as I always end up with more gain than I need. But you all caught me at a week moment with the transformer. I was just finishing my trials with the $12 Allied. when you were ploting this one, so I bought one, then well I have some 87's in the bin. what the hell group build sounds like fun.
The rectifer is a 6by5 and i have not listened to it yet. The wallwart I got at the thrift shop is dead...John

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Where's R1? [message #30768 is a reply to message #30756]

Mon, 28 February 2005 22:47

colinhester
Messages: 1349
Registered: May 2009
Location: NE Arkansas

Illuminati (3rd Degree)

I don't see the resistor R1 (1k) off the potentiometer. Am I just missing it or is not there?.....Colin

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"Cheap, easy to work and you get a cherry cobbler recipe to boot" [message #30770 is a reply to message #30756]

Tue, 01 March 2005 01:24

Wayne Parham
Messages: 18786
Registered: January 2001

Illuminati (33rd Degree)

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Re: Where's R1? [message #30772 is a reply to message #30768]

Tue, 01 March 2005 08:28

Forty2wo
Messages: 163
Registered: May 2009

Master

R1 is a grid stopper, on reflection I will probably add it.
They are not strictly necessary but are good isurance against oscillation
I left out R5, I think the amp will be sufficient load...John

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