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RE: Need some opinions and maybe a lot of help with 300B design.

A reasonable design, but you won't get a lot of power - maybe 3-4 watts. To get more, raise the 300B plate voltage or reduce the output transformer impedance (and raise the plate current). Or do both.

Here is the WE table of 300B operating points:


p-k	Bias	Current	Load	Power	2nd	3rd
Volts	Volts	mA	Ohms	Watts	db	db
200	-42	30	2000	 3.0	20	31
200	-39	40	2500	 2.6	26	38
200	-37	50	2500	 2.5	30	45
250	-55	30	2000	 4.9	18	27
250	-55	30	4500	 3.2	27	40
250	-52	40	3000	 4.0	26	36
250	-50	50	2500	 4.4	26	39
250	-48	60	2000	 4.7	26	38
250	-48	60	2700	 4.1	30	45
250	-45	80	1500	 5.0	26	41
300	-65	40	2500	 6.7	20	30
300	-63	50	2000	 7.2	21	29
300	-63	50	3000	 6.1	26	37
300	-61	60	2400	 6.6	26	37
300	-61	60	3400	 5.6	30	44
300	-58	80	1700	 7.5	26	37
350	-76	50	3600	 7.8	26	38
350	-76	50	5000	 6.2	30	45
350	-74	60	2000	10.2	21	30
350	-74	60	3000	 8.3	26	38
350	-74	60	4000	 7.0	30	44
350	-71	80	2200	 9.6	26	39
400	-91	40	5000	 8.4	26	37
400	-89	50	3000	11.5	21	31
400	-89	50	4000	 9.4	25	38
400	-87	60	3500	10.5	26	38
400	-87	60	5000	 8.3	30	46
400	-84	80	2500	12.5	25	37
450	-104	40	6000	 9.5	26	38
450	-102	50	5000	10.7	27	39
450	-102	50	6500	 9.0	30	45
450	-100	60	4000	12.5	26	38
450	-100	60	5500	10.1	30	44
450	-97	80	2000	17.8	21	30
450	-97	80	3000	14.6	26	37
450	-97	80	4500	11.5	31	45

When the second harmonic distortion at full power is 26dB down, that's 5%. That's a good middle-of-the-road value IMHO.


Edits: 03/14/16
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