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| Model 591 Equasonne | ||||||||||||||||
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| Download schematics for the 591 model. Selector RF Amplifier Power converter Speaker Tubes Service Notes |
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| Photos courtesy of Ron Wentz | ||||||||||||||||
| The model 591 (manufactured 19??) uses an identical chassis to Model 593. These two models are virtually identical to the 931, and differ only in the inclusion of a single capacitor connecting one side of the power mains to the grounding post on the selector unit! This capacitor is not used in the 931. The selector unit is of the 931 type, which does not include a 484/485 tube. The RF amplifier is also of the 931 type which is common to the vast majority of Equasonne models. The power supply also appears to be identical with that of the 931. The 591 requires an external speaker for operation. To the best of my knowledge there was no DC version of the 591. |
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| The restored and reassembled chassis of my 930 Equasonne. This chassis is identical to that of the 89A. The long black box at the back is the power converter unit, which also contains the power output tubes. At the front left is the selector unit with the 4 ganged tuning condensors, 2 of which are visible under the upper shielding. The rotating tuning drum with the dial scale is part of this unit. At the front right is the RF amplifier unit. The lid (with 8 holes) on this unit is removable to enable access to the tubes. It must be left in place during operation. | ||||||||||||||||
