Dumble Bargain
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Re: Dumble Bargain
OHH!! This is COOL! (Caps say 1976)
Tony
Tony
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" The psychics on my bench is the same as Dumble'"
- martin manning
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Re: Dumble Bargain
Very cool indeed! thanks for posting!
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Re: Dumble Bargain
regarding the Phoenix Preamp,there‘s a control labeled ˋ Taper‘ ,any ideas what it does?
- martin manning
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Re: Dumble Bargain
The term taper has been used for a high frequency cut (treble bleed, post-OD. Its location on the panel would support that.
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Re: Dumble Bargain
thank you,that makes sense
Re: Dumble Bargain
Too bad there's no gut shot of the preamp.
Re: Dumble Bargain
Here is the link to the 'scrapbook' the reverb ad mentions, with extra information from the owner
https://myalbum.com/album/5WtZHuNfc8pUWk/
https://myalbum.com/album/5WtZHuNfc8pUWk/
Re: Dumble Bargain
Correct: " ... Overdrive Controls: level, ratio, with internal trigger & h.f. taper ..."martin manning wrote: ↑Fri Mar 04, 2022 9:28 pmThe term taper has been used for a high frequency cut (treble bleed, post-OD. ...
source:
Here's another example (ODS150W #0121) of those four overdrive controls on the front panel: trigger (silver ring in the "level" location), taper (Marshall-like knob in the "level" location), level (silver ring in the "ratio" location), and ratio (Marshall-like knob in the "ratio" location)
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- pottedplant
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Re: Dumble Bargain
Interesting that the tube pairs are oriented in this manner, I tried to double check by looking at the internal view wiring but it's kinda hard to see. Did Dumble wire this amp to be paired as such or did the owner misunderstand Dumble's instruction when pulling 2 tubes for half power?
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- ijedouglas
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Re: Dumble Bargain
I doesn't matter, as long as you don't pull V4 + V5 or V6 + V7
Last edited by ijedouglas on Tue Mar 15, 2022 3:33 pm, edited 1 time in total.
Ian
- martin manning
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Re: Dumble Bargain
Any combination with one tube on each half of the OT primary should be equivalent:
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- pompeiisneaks
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Re: Dumble Bargain
and the basic rule is this:
you have two halves of the push pull amplifier. Both sides need one tube to operate. You do adjust the plate impedance when you do so, but it will still function without any negative impact to the circuit or tubes, it will just not sound the same.
If you leave one half without tubes it's bad juju.
~Phil
you have two halves of the push pull amplifier. Both sides need one tube to operate. You do adjust the plate impedance when you do so, but it will still function without any negative impact to the circuit or tubes, it will just not sound the same.
If you leave one half without tubes it's bad juju.
~Phil
tUber Nerd!
Re: Dumble Bargain
To be even more exact?
I wasn't dating the caps? I was dating the amp (using the most recent cap date as a reference)
Tony
" The psychics on my bench is the same as Dumble'"