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Old 19th March 2004, 06:19 AM   #1
hacknet is offline hacknet  Singapore
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Default 211 Preamp

i`ve heard of a couple of people enjoying a 211 as a preamp. but, i can`t seem to find any 211 preamp schmatics online.

any one know any?

looking at the datasheet, the 211 seems to have a rather high plate resistance. is this okay for preamp without an output transformer?
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Old 19th March 2004, 06:38 AM   #2
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Quote:
looking at the datasheet, the 211 seems to have a rather high plate resistance. is this okay for preamp without an output transformer?
Not unless it's used as a cathode follower
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Old 19th March 2004, 02:04 PM   #3
hacknet is offline hacknet  Singapore
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well, i`m not a great fan of cathode followers. i`ve found them dry compared to a plate follower.
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Old 19th March 2004, 02:07 PM   #4
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So have I. But it's a simple choice - follower or transformer unless you want a huge pre that can't drive anything.
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Old 19th March 2004, 04:09 PM   #5
hacknet is offline hacknet  Singapore
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hmm.. thats kinda crap...

in this case, can anyone recommend a tube i can impliment in a simple manner which is generally know for its dynamics and drive?

i`m using a 6900 now and it seems okay. i`m just looking for something more...
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Old 19th March 2004, 04:31 PM   #6
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Originally posted by analog_sa


Not unless it's used as a cathode follower

The 211 has a relatively high plate resistance for a power tube, but it's still lower than many of the tubes people like to use for pre-amps, including the 6SN7. Of course, to get the 211 up to a plate voltage/current where it's going to be happy will pretty much force the use of choke loading or the B+ will need to be in the several kV range

Peace
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Old 20th March 2004, 01:44 AM   #7
hacknet is offline hacknet  Singapore
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i was actually thinking of a 100H choke load.
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Old 20th March 2004, 07:18 AM   #8
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Hi hacknet, all

I used to have a chokeloaded 300b as output buffer in my linestage,
sounded ok, very "organic" sound

cheers
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Old 20th March 2004, 07:35 AM   #9
hacknet is offline hacknet  Singapore
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wow, okay...


would you attribute the organic sound to the 300b or the choke load?

i`ve heard much about choke loads but i`ve never tried... i think i`ll do so soon
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Old 20th March 2004, 07:49 AM   #10
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Quote:
`ve heard much about choke loads but i`ve never tried... i think i`ll do so soon
You owe it to yourself before embarking on adventurous high-voltage 211 plans. Choke loading sounds better than any resistor to my ears - more dynamics, better rhythmically, a more interesting sound in general. Just decide upon current and inductance and get on of Lundahl's plate chokes from Martin Electronics - you don't really need to buy expensive chokes to get great sound.
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