Re: A few suggestions for you LT ...

Posted by Naz (A) on December 1, 2006 at 14:14:14

In Reply to: Re: A few suggestions for you LT ... posted by lovetube on December 1, 2006 at 06:26:58:

Yes, should be OK but I would still increase current through either tube as recommended. The Emitter R will determine the current, which will be the same for either tube with the same value of R.

I also wondered about B+ for the first tube. The values used suggest a highish voltage, possibly 300V or so unless the current is extremely low in which case I'd also suggest increasing by reducing the value of cathode R a little. With a plate R of 330K even 0.5mA is OK for a 12AX7. Anything less and non-linearity would creep in.

Just FYI you can use higher B+ voltages than the rating of the tube as long as the plate voltage doesn't exceed the rating.

Cheers,
Naz

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Follow Ups Full Thread

Topic - Hi Naz. here is the full circuit of the 845 - lovetube 02:52:21 12/01/06 (14)

Sub 6SL7 for 12AX7, and 6BL7 for 12AU7, then good. Thanks ED 841!nt - -3db 22:28:17 12/01/06 (0)

Re: Hi Naz. here is the full circuit of the 845 - dave slagle 15:08:19 12/01/06 (7)

Re: Hi Naz. here is the full circuit of the 845 - lovetube 16:40:53 12/01/06 (6)

Re: Hi Naz. here is the full circuit of the 845 - dave slagle 18:28:07 12/01/06 (3)

Re: Hi Naz. here is the full circuit of the 845 - Dave Cigna 10:06:42 12/02/06 (1)

Re: Hi Naz. here is the full circuit of the 845 - dave slagle 19:07:25 12/02/06 (0)

Re: Hi Naz. here is the full circuit of the 845 - lovetube 18:32:52 12/01/06 (0)

Yes, where's the filament supply??? - korneluk 17:56:07 12/01/06 (1)

Re: Yes, where's the filament supply??? - lovetube 18:02:52 12/01/06 (0)

Re: Hi Naz. here is the full circuit of the 845 - korneluk 06:32:29 12/01/06 (1)

Re: Hi Naz. here is the full circuit of the 845 - lovetube 06:53:40 12/01/06 (0)

A few suggestions for you LT ... - Naz 05:57:52 12/01/06 (2)

Re: A few suggestions for you LT ... - lovetube 06:26:58 12/01/06 (1)

Re: A few suggestions for you LT ... - Naz 14:14:14 12/01/06 (0)

Follow Ups

Re: A few suggestions for you LT ... - Naz 14:14:14 12/01/06 (0)

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