I designed a2xel84 amp that I really like. So does a friend of mine. He asked me to build him one but with 4xel84's so he can get better clean volume for gigs.
The two tube model uses the 8 ohm tap for the FB loop. When I built the 4 tube model I wanted to keep all the parameters the same so I moved the FB loop to the 4 ohm tap. This is giving me the same FB voltage as the two tube model, all other FB loop part values being the same of course. But my question is...
After I did it, it occured to me that none of the vintage amps make this distinction for the FB loop. Why not? All the vintage amps use the same tap for both two and four tube models with all other part values remaining. This does mean that, for example, a 50 watt Marshall 1959 employs half the FB that a 100 watt 1959 does, right? Why did all the MFG's do it this way. Does this somehow make the smaller and larger amps sound and behave more similar than if the FB was the same?
The new amp I built is working and sounding good. I'm just wondering if there's something I've missed.
Thanks
Chuck
The two tube model uses the 8 ohm tap for the FB loop. When I built the 4 tube model I wanted to keep all the parameters the same so I moved the FB loop to the 4 ohm tap. This is giving me the same FB voltage as the two tube model, all other FB loop part values being the same of course. But my question is...
After I did it, it occured to me that none of the vintage amps make this distinction for the FB loop. Why not? All the vintage amps use the same tap for both two and four tube models with all other part values remaining. This does mean that, for example, a 50 watt Marshall 1959 employs half the FB that a 100 watt 1959 does, right? Why did all the MFG's do it this way. Does this somehow make the smaller and larger amps sound and behave more similar than if the FB was the same?
The new amp I built is working and sounding good. I'm just wondering if there's something I've missed.
Thanks
Chuck
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