The Amp Garage

For comparison a "Dumbleland Special" 150W: https://ampgarage.com/forum/viewtopic.p ... 84#p130484

What exactly do you think are the main differences between the circuits of a "Dumble Special" 150W, a "Dumbleland Special" 150W, and a "Steel String Singer" 150W? Or to put it another way: What modifications do you think turned the "Dumble Special" (model name on the front) into a "Steel String Sing...

John 8:7

... if (and this is a big IF) a speaker is very non-linear and is not matched as far as the pressure response in the push versus pull direction ... The guitar speakers in use today, as far as I know, are almost all more or less non-linear because they were intentionally designed that way by their d...

Alexander Dumble - Guitar Player Interview: How does your philosophy on speaker enclosures contrast with other companies? I think mine's different. I just don't believe in a baffle board with a couple of sides. Everything is designed to respond tonally. Even my open-back enclosures use air to the op...

A speaker cone that - for whatever reason - is not able to convert a symmetrical voltage fluctuation into a corresponding symmetrical air pressure fluctuation will of course also not be able to do this with reversed polarity. As I understand it, a polarity reversal of a sinusoidal voltage fluctuatio...

... in this example, rising peak has 1.4V amplitude, falling (second) has 0.8V amplitude. so in one speaker polarity TO YOU, in front, is coming the wave of 1.4V amplitude, and if you reverse polarity, to you in front is coming the second peak, falling , which is 0.8V. the first one 1.4V is now sho...

Source: https://audiouniversityonline.com/polarity-vs-phase/

These are two pictures of Henry Kaiser's/John Mayer's preamp:



Source: http://www.amparchives.com/folder/2529/

Resistor noise is both measurable and audible, so I accept that as real. I have wondered if that isn't what people are hearing, and describing with more flowery language? Or, perhaps if the presence of more or less noise affects the psycho-acoustic perception of the sound. As I understand it, one o...

Based on the listing description, the amp was brought back to HAD after he bought it in 1988 to have the tremolo circuit installed. HAD also seemed to use the MIEC caps in later (5th gen on) amps. I don't think we should be trying to date the amp based on those MIEC caps :D The TVAs do seem to be o...

And which date exactly are you interested in in terms of "building" this Odyssey? For example: Placing of the order? Delivery of the first finished version to the first owner? Completion of the version in which this Odyssey was offered for sale in this music store in 1988? Completion of the version ...

And what exactly do you mean by "original" in this context?

... (Caps say 1976) ... I was dating the amp (using the most recent cap date as a reference) ... " ... FULL RIVER CAP.CO.,LTD (MIEC) was established in 1979, more than 40 years experiences in this area, we specialize in producing aluminum electronic capacitor, major products are middle and high vol...

talbany wrote: ↑Fri Mar 04, 2022 7:20 pm ... (Caps say 1976) ...

To be exact (from left to right): 2 x MIEC 200uF/300V without a visible date - 2 x TVA 20uF/500V 1975 - 1 x TVA 20uF/500V 1976