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2A3 as an preamp
2A3 as an preamp
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Old 13th March 2019, 07:43 PM   #1
Frank40 is offline Frank40  Denmark
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Default 2A3 as an preamp

I am thinking of building a preamp using a single 2A3 tube, it will give me the gain I need, and it offers a low output impedance.

Have any of you any ideas if this tube is to noisy to be used in this application? If you have schematic on a preamp using this tube, I would love to see them.
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Old 13th March 2019, 08:04 PM   #2
euro21 is offline euro21  Hungary
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2A3 as an preamp
Tram2 is very useful.
DHT OTL Linestage - Tram 2
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Old 14th March 2019, 05:13 AM   #3
6A3sUMMER is offline 6A3sUMMER  United States
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If you use Any DHT (Directly Heated Triode), as a preamp, you need to use DC filaments.
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Old 14th March 2019, 11:02 AM   #4
Rod Coleman is offline Rod Coleman  United Kingdom
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2A3 as an preamp
TRAM2 is a good suggestion. It was used and hacked by a number of DIYers here, some of them from Denmark, too:

DHT OTL Linestage - Tram 2
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Old 14th March 2019, 03:53 PM   #5
Frank40 is offline Frank40  Denmark
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Thanks for the link looks very interesting.
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