Valve Radio and Audio Repair Handbook

U54	5.0	2.8	F.W.	500–0 − 500	250	16	75	IO	62
$\left.\begin{array}{l}\mathrm{U}78\\ \mathrm{Q}\mathrm{A}2407\end{array}\right\}$	(SQ)	6.3	0.6	F.W.	325–0 − 325	70	8	435	B7G	31
U709	6.3	0.95	F.W.	350–0 − 350	150	–	270	B9A	31
U319	20.0	0.3	H.W.	250	170	–	55	B9A	18
U31	26.0	0.3	H.W.	250	120	32	100	IO	55
U107	40.0	0.1	H.W.	250	90	12	200	B7G	13
Mazda
UU10	4.0	2.3	F.W.	500–500	180	8	–	B4	14
U201	20.0	0.2	H.W.	250	f90	16	47	IO	55
U281	28.0	0.2	H.W.	250	120	16	47	IO	55
U404	40.0	0.1	H.W.	250	90	50	180	B8A	f1
Mullard
AZ31	4.0*	1.1	F.W.	500–0 − 500	60	60	–	IO	60
G232	5.0	2.3	F.W.	500–0 − 500	125	60	150	IO	62
G233	5.0	2.8	F.W.	500–0 − 500	250	–	–	IO	62
G234	5.0	1.9	F.W.	550–0 − 550	160	60	175	IO	62
E235	6.3	0.6	F.W.	325–0 − 325	70	16	350	IO	54
E240	6.3	0.6	F.W.	350–0 − 350	90	50	300	B8A	14
E241	6.3	0.4	F.W.	250–0 − 250	60	50	325	B8A	14
E280	6.3	0.6	F.W.	350–0 − 350	90	50	300	B9A	31
E281	6.3	1.0	F.W.	350–0 − 350 ...