Hi Doc. I thought those numbers rang some bells. They are Motorola numbers.
And from my trusty Motorola Semiconductor Data Book (1970) here are the specs: MR1033B Peak repetitive reverse voltage: 300 V Non-repetitive reverse voltage: 400 V RMS Reverse voltage: 210 V Average repetitive forward current: 3 A Peak repetitive forward current: 25 A MR1034B Peak repetitive reverse voltage: 400 V Non-repetitive reverse voltage: 500 V RMS Reverse voltage: 280 V Average repetitive forward current: 3 A Peak repetitive forward current: 25 A Both of these can be replaced by a 1N4722. Actually, the 1N4722 is direct substitute for the MR1034B. The 1N4721 has lower voltage ratings. You could most likely substitute a 1N5403 for the MR1033B and a 1N5404 for the MR1034B. Or as Garey pointed out, a 1N5408 could most likely substituted for either or them. I hope this helps. 73 - Mark N1VQW _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
