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Old 10th March 2003, 09:46 AM   #1
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This poll is for educative reasons only. Meant as part of a project on preamplifiers.
1.What do you define as "preamplifier"?
a. part of the reproduction chain
b. gain/attenuation stage
c. signal control stage
d. other multiple answers possible
2.How many inputs/sources should a preamplifier accept?
a. 1
b. 2
c. 3
d. 4
e. >4
3.How many channels should a preamplifier have?
a. ...1
b. 2
c. 5.1
d. other
4.Should a preampifier have an IR control?
a. yes
b. no
5.If yes, what should it control?
a. input selection
b. volume control
c. both
d. other
TECHNICAL STAGE
6.What are the specs a preamplifier should fulfill?
a. low distortion
b. drive ability / high current
c. high gain
d. high bandwidth
e.other multiple answers possible
7.What should, according to your opinion, the active devices be?
a. semiconductors - BJT
b. semiconductors - fet
c. opamps
d. tubes
e. hybrid if hybrid, refer to which combination
f. none of the above
8.If you were to build a preamplifier, which would be the design you would use?
(describe briefly)


For statistical reasons, please include your age, and, if possible, occupation. Thanks!!
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Old 10th March 2003, 10:19 AM   #2
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1.What do you define as "preamplifier"?
c. signal control stage

2.How many inputs/sources should a preamplifier accept?
d. 4

3.How many channels should a preamplifier have?
b. 2

4.Should a preampifier have an IR control?
a. yes

5.If yes, what should it control?
c. both

6.What are the specs a preamplifier should fulfill?
a. low distortion
d. high bandwidth
and lowest possible noise

7.What should, according to your opinion, the active devices be?
c. opamps
or d. tubes(depending on the ressources and on the target system)

8.If you were to build a preamplifier, which would be the design you would use?
Standard opamp design, with conventional volume control. A 3 band tone control would be integrated with a defeat switch.

18Y-Student in EE
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Old 10th March 2003, 10:30 AM   #3
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Quote:
Originally posted by costiss
This poll is for educative reasons only. Meant as part of a project on preamplifiers.
1.What do you define as "preamplifier"?
a. part of the reproduction chain
b. gain/attenuation stage
c. signal control stage
d. other
multiple answers possible
a, c
b: attenuation, minimum gain
often unnessesary.

Quote:
2.How many inputs/sources should a preamplifier accept?
a. 1
b. 2
c. 3
d. 4
e. >4
e

Quote:
3.How many channels should a preamplifier have?
a. ...1
b. 2
c. 5.1
d. other
b

Quote:
4.Should a preampifier have an IR control?
a. yes
b. no
yes, provided it doesn't sound worse than doing it manually.

Quote:
5.If yes, what should it control?
a. input selection
b. volume control
c. both
d. other
a
d: mute, abs phase

Quote:
TECHNICAL STAGE
6.What are the specs a preamplifier should fulfill?
a. low distortion
b. drive ability / high current
c. high gain
d. high bandwidth
e.other
multiple answers possible
a: yes
b: absolutely
c: absolutely not
d: a decade above the audio band is nice. More can present RFI problems in some instances.

Quote:
7.What should, according to your opinion, the active devices be?
a. semiconductors - BJT
b. semiconductors - fet
c. opamps
d. tubes
e. hybrid if hybrid, refer to which combination
f. none of the above
d

Quote:
8.If you were to build a preamplifier, which would be the design you would use?
(describe briefly)
What I've built
2 seperate phono stages (soon 3) -> selector -> TVC -> poweramp
4 line level -> selector -> TVC
Buffered line out (for recording)

Quote:
For statistical reasons, please include your age, and, if possible, occupation. Thanks!!
5 in dog years
bum.

If you use any of this info for your commercial advantage, I expect to get paid.
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Old 10th March 2003, 11:11 AM   #4
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Question Poll

Hi Costiss,
You have obtained permission from the moderators to post a Poll?
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Old 10th March 2003, 05:31 PM   #5
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1. feels kind of unfair. No option for just amplification. Obviously, a preamp that is attenuating, not amplifying, is not an amplifier per se. (Sorry 'passive preamp' guys, it's true.)

2. As many as needed. You might only need one for gain, or ten for mixing multiple instruments together in a recording.

3. b., 2 channels; but this again depends on needs...

4. b. unnecessary IMO, but convienient if you want to put in the trouble.

5. c. (if something's worth doing, it's worth doing right!)

6. a.

7. d., but I'm biased (c). should be acceptable in theory.

8. I covered this in a thread on the tubes forum (My Preamp). - Am awaiting pots so I can get on with the project.

Tim
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Old 13th March 2003, 10:41 AM   #6
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1.c
2.d
3.b
4.b
6.a,b
7.d,c
8. 6072 cathode follower/ single opamp
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Old 16th March 2003, 09:30 AM   #7
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help me.... one week left
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Old 17th March 2003, 09:30 PM   #8
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1) a,b,c
2) d
3) b
4) b
5) -
6) a, d
7) b
8) -
poli epaggelmatiko to erotimatologio sou.

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Kali epitixia
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