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Thursday, July 23, 2015

211 -The Next Generation- Part 4 : 801A Drives 211 Layouts


As mentioned, there are several more 211 amplifiers in the works besides the 211 drives 211 monos. While waiting for the chassis for the 211/211 I started with the layout work of two sets of 801A drives 211 amps.

One set is meant to be used with restricted space above, so it uses more floor space but less height. The arrangement is in a square again and shown above. The 801A driver is at the back side on the right close to the input connector. The signal routes from the input through the tube to the Tango NC20 interstage transformer in the front right corner. From there to the 211 output tube in the front left corner and back to the rear through the Tango X10S output tranfsformer to the speaker connectors.

Some of the capacotors found their place on the top plate, the rest of the caps will be mounted inside along with the B+ and filament chokes and input transformer.

The separate PSU chassis follows a similar design approach as the 801A/211 amps presented a while ago : 

All Power transformers placed under covers. One large B+ transformer and two separate filament transformers for 211 and 801A.

The well proven TV Damper rectifier bridge at the front. Two caps found a little spot behind the B+transformer. All other caps and chokes will be inside.

The size of each chassis will be 380 by 380 mm. Height of the wooden frames still to be determined (approx 150mm).

The second set will have a smaller floorspace. The footprint will be square as well.

A similar layout as the first amp but only tubes, interstage and output transformer on the top.

300 * 300 mm footprint, obviously the body will have to be higher to fit all the remaining components.

The power supply layout:

Only the B+ transformer on the top along with the rectifiers.

Several tiers of components will be needed inside to fit everything in.

A comparison between the two layouts:

Stay tuned for updates as the construction of these amps progresses.

Best regards


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