Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: rzenc on June 10, 2011, 12:12:04 pm

Title: 5670 tubes
Post by: rzenc on June 10, 2011, 12:12:04 pm

Hi,
I would like to know if you guys have experience with this tube type and what are/were your impressions about it. I have some and was thinking about messing with them. They seem to be a good candidate for 12AU7 type of application???

Thanks in advance
Best regards

Rzenc

Title: Re: 5670 tubes
Post by: HotBluePlates on June 11, 2011, 08:09:20 am

The amplification factor is about midway between a 12AU7 and a 12AY7. Might be a good low-gain tube for tweed input stages.

Title: Re: 5670 tubes
Post by: rzenc on June 11, 2011, 09:27:24 am

Thanks HBP!!!

I haven't noticed gain structure, however I did notice transconductance is around 5500uMHOS, which could be employed to achieve low impedance outputs via C.F.'s with around 180 Ohms.
I will give it a try on a FX loop.

Thanks!!
Best Regards

Rzenc

Title: Re: 5670 tubes
Post by: Tone Junkie on July 18, 2011, 03:44:35 pm

Has anyone learned anything more about this tube Im always looking for more tubes to plug in as Im dialing in an amp. I know tubnit has used a 12av7 iwhile playing around I guess this has about the same amplafication facter.
Thanks Bill