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is this reg ok for 300b Fil ? comment please

122.108.106.53
Posted on November 6, 2009 at 17:02:06
lovetube
Dealer

Posts: 2334
Location: Melbourne Australia
Joined: June 8, 2003



Thanks
LT

RE: is this reg ok for 300b Fil ? comment please, posted on November 7, 2009 at 03:45:19
Al Noakes
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Posts: 517
Location: London
Joined: November 24, 2008
 That design will nail the hum down but it's unlikely it will sound very good , AC will probably sound better . My suggestion is to try a ring of two CCS , rather than a series regulator . CCS connected chip regs sound ok but no-where near as good as a ring of two . If you absolutely must use a series reg , follow it with a laminated choke >30mH . You will need to adjust the output voltage by adding diodes between the reg 0v pin and 0V rail or use an adjustable reg if you do this

ps I don't know what that 1000uF cap on the output of the reg chip will do , I've never seen caps this value used in that place before . It may cause some instability

Al

a ring of two CCS, posted on November 7, 2009 at 10:03:11
SomeJoe
 Got a schematic handy?
Did you find this online or design it yourself?, posted on November 6, 2009 at 17:36:46
slownlo
Audiophile

Posts: 1067
Joined: October 11, 2003
 The LV805CV is a 5V/1.5A fixed voltage regulator, and can support the filament current demand of the 300B, Just use an AC transformer with a secondary voltage of 7.5VAC and current support of at least 1.5A (or more) and you should be good to go...
RE: Did you find this online or design it yourself?, posted on November 6, 2009 at 18:17:35
lovetube
Dealer

Posts: 2334
Location: Melbourne Australia
Joined: June 8, 2003
 i found it on line.
should i be more clear on my question . I know it is ok for 300b but is this any good ?
as other said I might be go for current reg instead or should this one is a fine one ?
Cheers
LT

RE: Did you find this online or design it yourself?, posted on November 6, 2009 at 18:36:10
slownlo
Audiophile

Posts: 1067
Joined: October 11, 2003
 Yes, Its "good"....but like Chris-O said, a current reg is better to use...

RE: is this reg ok for 300b Fil ? comment please, posted on November 6, 2009 at 17:32:42
Chris O
Audiophile

Posts: 3060
Location: Memphis, TN
Joined: March 22, 2002
 Better to use a current reg than a voltage reg. You can use a LT1085 "floating" with a +or- 1 ohm resistor between the output and adjustor legs.

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Long Live Dr.Gizmo

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