Dumbleland update (was SSS) :D

[Max]

Would you share those "150W SSS datasheets" with us?

Hi David,

here's a word by word copy of the one I have:

data sheet

Dumble
Amplifiers

"Steel String Singer"

The "Steel String Singer" is designed to deliver the guitar sound necessary to fill stadiums and large halls. The power ability and tone circuitry work together to produce volume and tone of very exiting dimensions. The amplifier provides the player with a huge, clean sound that is enriched with a warm, singing quality.


SPECIFICATIONS

Power Output: 150 watts of true power
Dimensions: 12"H x 28.25"W x 10.5"D
Weight: 80 pounds (head only)
Power Requirements: 120VAC, 60Herz, & 540VA at full output
Output Impedance: 4 ohms and 8 ohms switchable
Input Impedance: NOR = 1M ohm, and FET = 3.3M ohms


TUBE COMPLIMENT

4 x 7025 high-mu twin triodes
1 x 5751 high-mu twin triode
4 x 6550A beam power tubes


CONTROLS AND EQ SWITCHES

Preamp Controls: volume, treble, middle, and bass
Preamp Switches: bright, deep, rock/jazz, hi step filter & low step filter
Reverb Controls: send, and return levels
Master Section: master volume, and presence


SIGNAL CONNECTIONS

Inputs: NOR, and FET
Access ports: preamp out and power amp input (2.5V, 500K ohms)
Outputs: main speaker, and extension speaker


POWER SWITCHES

A.C. mains on/off
A.C. mains grounding
Operate/standby


REMOTE SWITCHING

preamp boost on/off
reverb on/off


Cheers,

Max

[boldaslove6789]

Thanks Max w/ the fax!!

[Max]

Dumble Data Sheet

"DUMBLE LAND 300SL"


SPECIFICATIONS

Power Output: 300 watts true power
Output Impedance: 2 or 4 ohms
Input Impedance: NOR = 1M ohm, and FET = 3.3M ohms


TUBE COMPLIMENT

2 x 7025 high-mu twin triodes
1 x 5751 high-mu twin triode
1 X 12AU7
2 x 12BH7
6 x 6550A beam power tubes


CONTROLS AND EQ SWITCHES

Preamp Controls: volume, treble, middle, and bass
Preamp Switches: bright, deep, rock/jazz, and preamp boost [Max: PB = rock/jazz middle position]
Filters: Hi and Low step filter
Reverb Controls: Send, and return levels
Master Section: master volume, and presence


SIGNAL CONNECTIONS

Inputs: NOR, and FET
Access Ports: preamp out, and power amp input (2.5V, 500k ohms)
Outputs: main speaker, and extension speaker


POWER SWITCHES

A.C. mains on/off
A.C. mains grounding
operate/standby

ADJUSTMENTS

Bias Adjust


REMOTE SWITCHING

Reverb on/off

source: http://web.archive.org/web/200801210049 ... 300sl.html

AFAIR this data sheet is consistent with what I remember to have seen in one of these amps.

Cheers,

Max

[David Root]

Thank you Max.

[jlatrace]

I need some help. I have looked everywhere and cannot find the specs for a filter choke for a 150W SSS. Closest I get is the Sunn schematic that shows two Sunn 3-10 chokes in parallel.. Any suggestions?

[67plexi]

Most high power tube amps used a 4 Henry choke Quad KT88 or 6550A
Fender used a 4 Henry 90mA in the 200 watt and 400 watt amps. I think that's on the weak side.
I'm starting out with a 5 Henry 150mA. The transformers that Dumble cannibalized for the
150 watt SSS did not use a choke.

Good luck, Steve.

[Roe]

I'd guess 3-5H, ca 150mA (for KT88s)

[jlatrace]

Most high power tube amps used a 4 Henry choke Quad KT88 or 6550A
Fender used a 4 Henry 90mA in the 200 watt and 400 watt amps. I think that's on the weak side.
I'm starting out with a 5 Henry 150mA. The transformers that Dumble cannibalized for the
150 watt SSS did not use a choke.

Good luck, Steve.

Thanks!

[jlatrace]

I'd guess 3-5H, ca 150mA (for KT88s)

Thanks!

[Bombacaototal]

deleted