The Dynaco Tube Audio Forum

Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Dynaco VTA tube amp kits, all Tubes4hifi.com products and all Dynakitparts.com products


    300B as a tube for a Class A/B Amp. or why not?

    Share

    sailor

    Posts : 269
    Join date : 2011-04-04

    300B as a tube for a Class A/B Amp. or why not?

    Post by sailor on Wed Dec 11, 2013 9:07 pm

    I have looked all over the internet to see if anyone is making a Class A/B amp using the 300B. All I could find was single ended class A and Push/Pull Bios as class A. In the push pull Class A configuration the amp can make about 25 Watts. But the plate dissipation is 40 watts a tube so as a class A/B it would make considerably more watts, as well as run cooler and the tubes would last longer.
    Does anyone know of a good reason that it should not be used in a Class A/B amp? I did notice that the curves are terrible at very low amperage, the worst I have ever seen, could this be the reason?

    arledgsc

    Posts : 340
    Join date : 2012-11-30
    Location : SF Bay CA

    Re: 300B as a tube for a Class A/B Amp. or why not?

    Post by arledgsc on Thu Dec 12, 2013 10:25 am

    Cool ideal but cost would be my major concern.   How much is a 300B running these days?

    dougmon

    Posts : 65
    Join date : 2013-11-04
    Age : 60

    Re: 300B as a tube for a Class A/B Amp. or why not?

    Post by dougmon on Thu Dec 12, 2013 11:21 am

    You can get a single 300B (new production) for between $90-100US. The NOS prices are astronomical, though, from what I've seen.

    sailor

    Posts : 269
    Join date : 2011-04-04

    Re: 300B as a tube for a Class A/B Amp. or why not?

    Post by sailor on Thu Dec 12, 2013 1:02 pm

    Parts express has a matched quad of Electro-harmonix 300B $371.37 with free shipping. I would think that a Class A/B amp would be able to produce 50 watts of power.

    Sponsored content

    Re: 300B as a tube for a Class A/B Amp. or why not?

    Post by Sponsored content Today at 11:56 am


      Current date/time is Tue Dec 06, 2016 11:56 am