Bosch 601
Several omissions of parts values were in the preliminary schematic dia gram of this set which was published on page 7-20 of Rider's Volume VII and these missing values will be found below opposite the diagram number by which the various components are des ignated. The connections are the

Same in the final schematic as they are shown on the above-mentioned page with the one exception: A 0,5 mf. condenser has been inserted be tween the high side of the filament supply and ground. Draw this in on your schematic just to the left of the dial lamp (No. 53) where the lead to the filament of the 1A4 tube is connected. The part number of this new condenser is CW 2-50 and its diagram number is 57.

Top view of Bosch 601 chassis

Also check the values of diagram numbers 55 and 56; they should be 0.94 and 0.42 ohm respectively.

Below will be found the alignment data for this receiver together with the layouts of the apparatus on both the top and bottom of the chassis. The numbers of the parts correspond with the diagram numbers on the schematic already published in Rider's Volume VII.

Bottom view of Bosch 601 chassis

Bosch 605, 605C
The final schematic is the same as the preliminary, which will be found on page 7-25 of Rider's Volume VII, with the following change in the value of the.01 - mf, condenser, Diagram No.

39. The new value is.005 mf., Part No. CW4-005.
Below will be found that resistance of the windings of the power transformer:

Please add these data to the schematic,

Bosch 650

The final schematic of this model is the same as the preliminary, which will be found on page 7-33 of Rider's Vol ume VII, with the following exceptions:

Note that the part numbers only of items 18 and 23, are changed; the values remain the same.
Please make a correction on the schematic. The lower plate of condenser No. 10 should be connected to the junction of the tuning condenser and condenser No. 12. This was omitted from the drawing.

Bosch 640
The final schematic is the same as the preliminary, which will be found on page 7-31 of Rider's Volume VII, with the following exceptions:
Please make these changes in the list of parts on Bosch page 7-32 in Rider's Volume VII.

Silvertone Wave-trap Change
Wave-trap, Part No. 1013114477, used for eliminating code interference in models 1986, 1987, 4403, 4463, 4464, 4484, 4563, and 4584 (see page 7-45 of Rider's Volume VII), IS described as having wree leads.
In later production of this trap only two leads were used, having the colors black and green. The green lead is to be connected to the green lead of the set's antenna lcad or connected to the antenna terminal, if the receiver has a terminal board. The black lead of the trap is to be connected to ground.
This trap acts as a series resonant circuit connected across the antenna and ground terminals of the set.