Smalles tube amp

[drpietrzak]

Re: Smalles tube amp

changing preamp tubes will usually not reduce the volume noticeably....will reduce gain / distortion though...

I am not a technician. I am a player and a family guy. I have switched preamp tubes in amps a lot. Never has the family noticed, nor I, a significant volume change.

I reiterate ... Killer Ant test drive time.

 

[wanmei1]

Re: Smalles tube amp

Quote:
Originally Posted by Myles
Well ... in the end it is personal taste. I have never heard an amp that uses a 12AU7 in the first tone and gain stage that I liked.

An AU7 is never a satisfactory tone/gain stage tube from my point of view. It is not just a matter of gain ... they are great current pushers (phase inverters) in some amps but never in my mind a tone stage tube.

As far as amps that do use a 12AU7 in the first gain stage can you give me an example as I cannot think of any myself which are guitar amps. Perhaps in hifi amp it is done but I cannot think of any standard classic amps that use an AU7.

Vox AC50 ..The Beatles used these for early recordings.
Vox AC 100
Ampeg SVT
Traynor YBA 200
Ashton Blue Tongue 100
Gibson Gibsonette.

Yes .... those are a few and the AC50 is one of the most amazing amps of all time but ..... those amps were designed around that tube rather than one putting an AU7 in an AX7 intended spot.

Myles,
Merry Xmas !

 

[tonedeaf1]

Re: Smalles tube amp

I use this to squash the volume of my Valve Jr. There is a little change in tone at the lowest settings but I think that may have more to do with the way the ear hears things at lower volumes, than an actual change in the tone. This is a stepped transformer, it is not an L-Pad (variable resistor).
http://www.radioshack.com/product/i...ategoryId=2032057&support=support&tab=support

 

[Myles]

Re: Smalles tube amp

Quote:
Originally Posted by Myles
Well ... in the end it is personal taste. I have never heard an amp that uses a 12AU7 in the first tone and gain stage that I liked.

An AU7 is never a satisfactory tone/gain stage tube from my point of view. It is not just a matter of gain ... they are great current pushers (phase inverters) in some amps but never in my mind a tone stage tube.

As far as amps that do use a 12AU7 in the first gain stage can you give me an example as I cannot think of any myself which are guitar amps. Perhaps in hifi amp it is done but I cannot think of any standard classic amps that use an AU7.

Vox AC50 ..The Beatles used these for early recordings.
Vox AC 100
Ampeg SVT
Traynor YBA 200
Ashton Blue Tongue 100
Gibson Gibsonette.



Myles,
Merry Xmas !

You have a great Xmas and New Years too. I will be on here a bit less for the next week or so as I am on the road. I left the shop yesterday and will be heading North in California ... L.A. to SFO and perhaps beyond but I will check in when I have Internet access.