Are these voltages accepable?

[Howlin' Mad Mac]

I've a set of Princeton transformers lying about just waiting for a project & last night I came across a rather interesting schematic for a Montgomery Wards/Airline Model GDR-8513A which should put them to good use however the secondary voltage is a good bit higher. Here's the original schematic plus my redrawn & slightly modified version for comparison. Changes made to the original are: 1.) added 1M pull down resistor to input, 2.) deleted 2nd input, mix resistors & microphone input/volume control, 3.) added pair 1k screen resistors on output tubes, 4.) changed output tubes from 6V6GT to EL84, 5.) added pair 1k5 grid resistors, 6.) changed rectifier from 6X5GT tube to pair of 1N4007 silicon diodes, 7.) added 2k2/10W power resistor before reservoir to lower voltage, 8.) added 220R drain resistor across reservoir & standby switch, & 9.) altered B+ rail resistors after some experimentation with Duncan's PSU Designer II. This brings me to my query... based upon models created in PSU Designer, when recreating the original supply voltage at the 3rd tap was only 24v. Now I've seen designs running 12AU7 tubes with voltages that low but it's not what I'd call the norm. After looking up the 6AU6 datasheet I noticed max voltage was around 200v with typical applications around 160v, hence I've decreased the last resistor in the rail with a value 50k less than the original pushing the voltage up to 152v. So will this thing work as drawn or do I need to run the 6AU6 tubes close to 24v & if so, why?

airline-gdr-8513a-amplifier-schematic.pdf
Frequent Flyer.pdf

[Howlin' Mad Mac]

Oops... Just looked everything over one last time & noticed I forgot to change bias resistor for EL84 tubes. Please mentally change this value from 220R to 150R when reviewing my drawing.

[tubeswell]

Interesting that the airline amp has the volume and tone both before the 1st gain stage. This would tend to load up the pickups and lose a lot of highs I guess. What instrument are you intending the amp for Mac?

[loudthud]

After looking up the 6AU6 datasheet I noticed max voltage was around 200v with typical applications around 160v, hence I've decreased the last resistor in the rail with a value 50k less than the original pushing the voltage up to 152v. So will this thing work as drawn or do I need to run the 6AU6 tubes close to 24v & if so, why?

The RCA data sheet in RC-19 for the 6AU6 under "Class A1 Amplifier Maximum Ratings" lists plate voltage of 300V max in pentode mode and 250V max in triode mode. Where are you getting 200V?

Also, where did you get current values to plug into PSU designer? There are no voltages listed around the 6AU6 tubes to get current values. The results of PSU designer are only as accurate as the data you feed it. If you put a current source in as a load, you can even make the B+ go negative if the current is too high. Don't worry about the 6AU6 voltages, just build it.