More sag please... Weber Copper Caps?

[dartanion]

A good place to start is on Aiken's site. Lots of great info there and no BS. There are tube manuals available for download all over the internet, so grab one and start reading. Find a copy of RDH4 and grab that too. Peter Millet's site has most of this stuff.

For your Dumble, it sounds like you want something that the Dumble isn't.

[mlp-mx6]

My honest recommendation is to wait and learn more. Also play the amp more and see how it feels. If you're digging the cleans then changing the power amp/power supply is going to change the clean tone too, not just the OD tone.

The Deluxe sounds/feels the way it does in part because you're driving the power section hard and getting distortion in several places in the circuit all adding up (or multiplying, as the case may be).

The Dumble circuit is not set up to behave that way at all. The power amp is intended to be rather clean all the way up, and the mojo is from the preamp. Don't get me wrong, it is most definitely a system, and everything adds to the mojo, but the majority of the OD is in the preamp.

The words "squishy" and "Dumble" don't go together very well, methinks.

[cdc3jj]

In an effort to learn a little more about this subject I emailed Nik and he said "Well, the PT doesnt have 5V tap for the tube rectifier, actually. If you can install a 5V-0 tranny inside, then you can do this."

What did he mean by installing a 5v-0 tranny? Meaning in addition to the current tranny? I asked about swapping out to a bassman tranny which has the 5v tap and he said "The bassman PT wont have the 6-0 tap for the relay power supply." Which leads me to believe it's something in addition to the current PT. Can anyone put the cookies on the bottome shelf for me? Thanks

[mlp-mx6]

Can anyone put the cookies on the bottom shelf for me? Thanks

Yes, but it is hard to do that with a clear conscience. There is a LOT of risk to your life in opening up a tube amp. From the questions you are asking you're quite new to that experience, so folks are naturally going to be hesitant to encourage you to get in and change things.

However, yes, Nik is saying to put an additional xfmr in there to supply the 5V filament supply for a tube rectifier. Your current power xfmr apparently has an extra 6V tap for supplying the relays ("extra" meaning in addition to the heater supply, which is also 6V).

Perhaps a better approach to take would be for you to point to some well-known (or at least available) guitar tones on record and use those as a frame of reference for what you are pursuing.

[talbany]

Yes, but it is hard to do that with a clear conscience. There is a LOT of risk to your life in opening up a tube amp. From the questions you are asking you're quite new to that experience, so folks are naturally going to be hesitant to encourage you to get in and change things.

However, yes, Nik is saying to put an additional xfmr in there to supply the 5V filament supply for a tube rectifier. Your current power xfmr apparently has an extra 6V tap for supplying the relays ("extra" meaning in addition to the heater supply, which is also 6V).

Perhaps a better approach to take would be for you to point to some well-known (or at least available) guitar tones on record and use those as a frame of reference for what you are purs

Posted same time just repeating above!!




The problem you have is Nick had his transformers spec for a 6V winding to run the relays...So that locks you in as far as changing to an off the shelf..Either way you look at it your going to have to add a transformer to run the relays or the filiments for the rectifier if you decide to go there.. Nik's saying you need to add the transformer to run the filiments for the rectifier tube.. Most of the sag you get from the rectifier is attributed to the plate resistance of that particular tube itself.. Each have different plat resistances so each drop different amounts of voltages so each sag differently..The 2 most common are the GZ-34 and 5U4 look up the plate resistance of both as the 5U4 has the highest voltage drop of the 2.. That simulates the plate resistance of the tube giving you the sag you want without going through all the trouble of adding a tube rectifier..Have someone who knows amps do this as you will need to find the right resistor to handle the current as well as mounted properly.. If you don't know what your doing and do this yourself you can kill your Power transformer or yourself..FOERVER BLACKNESS!! Good Luck

Tony

[odourboy]

On the topic of sag, here's one of my expereinces:

I used a Hammond Organ reverb amplifier as a donor for a 6V6 nonHRM build. I started a thread here on the build some time ago. https://tubeamparchive.com/viewtopic.php?t=4880 Anyway, the Hammond AO-35 PT had a very high output impedance (I think I calculated it to be about 365 ohms IIRC, but don't quote me). The resulting amp was SQUISH CITY. I like a bit of sag, but this was too soft. Anyway, just thought I'd mention it.