Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: mresistor on October 01, 2017, 01:48:35 pm

Title: Shuguang 274B rectifier anyone?
Post by: mresistor on October 01, 2017, 01:48:35 pm

Wondered if anyone has tried a Shuguang 274B in a guitar amp in place of a 5U4 or 5AR4?  It is quite large with a width of 2.5 inches. Might not fit in a lot of amps. The audio guys have good things to say about the tube, and the price isn't too bad. They have some pretty tall plates.



example http://www.thetubestore.com/Tubes/5U4-Tube-Types/Preferred-Series-274B-5U4G (http://www.thetubestore.com/Tubes/5U4-Tube-Types/Preferred-Series-274B-5U4G)

Title: Re: Shuguang 274B rectifier anyone?
Post by: tubeswell on October 02, 2017, 01:02:05 am

I haven't used the specific ST 5U4Gs but I have used heaps of Sovtek 5U4Gs (which the STs are copies of). They are excellent rectifiers.

Title: Re: Shuguang 274B rectifier anyone?
Post by: mresistor on October 02, 2017, 07:32:48 pm

Cool ! I notice these big tubes only pull about 2.5 amps filament current.

Title: Re: Shuguang 274B rectifier anyone?
Post by: tubeswell on October 03, 2017, 12:30:18 am

I haven't measured the filament draw of these