Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: tubenit on January 15, 2015, 05:44:26 am

Title: 5725 pentode
Post by: tubenit on January 15, 2015, 05:44:26 am

Anyone built an amp using this 5725 tube?  And if so,  ........... how'd you like it?

http://tdsl.duncanamps.com/show.php?des=5725 (http://tdsl.duncanamps.com/show.php?des=5725)

Looking at ebay,  they seem to go for $3-$5 range.  Might be another nice alternative to the 5879?

There are some soundclips here of one using a 5725 in V1:

http://chasingtone.com/dvnator/tag/low-wattage/ (http://chasingtone.com/dvnator/tag/low-wattage/)

with respect, Tubenit

Title: Re: 5725 pentode
Post by: jazbo8 on January 15, 2015, 06:14:35 am

There are quite a few amps built with the 5725 over at the Wattkins forum, look up the Thrifty, Pushy, Tone Dawg Croaker, etc.

Title: Re: 5725 pentode
Post by: Willabe on January 15, 2015, 10:17:07 am

From GE tube book, says it's 5 star tube;

Dual-Control RF Pentode (Special 6AS6)

6.3v @ 0.175A for heater

Max plate volts; 200, max plate watts; 1.55

Max screen volts; 155, max screen watts; 0.75

Gm, umhos; 3.2K

Pin;
1. G1
2. K
3/4. heaters
5. P
6. G2
7. G3


           Brad    :icon_biggrin: