In Reply to: Goodbye Type 45 ....... hello JJ 2A3-40 posted by drlowmu on October 10, 2016 at 11:34:51:
First post here :)
Don't blame the tube , it could easily be implementation related , assuming this is a DIY rather than commercial amplifier
Sounds like you have a power supply related issue . Swapping a type 45 to a 300B (or rather a 2.5V filament 300B in the case of the 2A3-40) , you were obviously using a suboptimal supply configuration for the type 45 , which IMO is one of the more perfect tubes out there . I suspect if you measure the output impedence with the 45 in place you will see anomalies which can be isolated to the power supply configuration . Inadequate reservoir capacitance is probably the culprit
John Rush
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Follow Ups
- RE: Goodbye Type 45 ....... hello JJ 2A3-40 - Rush Audio 06:02:53 10/12/16 (14)
- RE: Goodbye Type 45 ....... hello JJ 2A3-40 - PakProtector 03:24:33 10/18/16 (0)
- LOL - drlowmu 09:43:10 10/12/16 (12)
- RE: LOL - Rush Audio 06:11:37 10/13/16 (5)
- RE: LOL - cpotl 09:23:56 10/14/16 (1)
- RE: "well as their level of intimacy with people they consider to be high-status".... - Ivan303 09:54:58 10/14/16 (0)
- RE: Why are some still here? - deafbykhorns 07:18:48 10/14/16 (0)
- Narcissistic Personality Disorder - Triode_Kingdom 10:18:27 10/13/16 (0)
- John - drlowmu 08:09:20 10/13/16 (0)
- designing with that attitude leads to confirmation bias - Kloss 06:02:02 10/13/16 (3)
- another take in the same direction.... - PakProtector 03:52:08 12/20/16 (0)
- RE: designing with that attitude leads to confirmation bias - Cpwill 05:41:57 10/18/16 (0)
- Yep... - Ivan303 08:26:04 10/14/16 (0)
- err, there can be nothing pertaining to humble in that statement, Jeff~nT - Cleantimestream 11:29:56 10/12/16 (1)
- :-) /nt - Ivan303 12:26:01 10/12/16 (0)