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save a frank part 2 [message #14957] Sun, 26 December 2010 23:48   cassent5150 Messages: 341 Registered: August 2009 Senior Member I need a schematic for this model if anyone can email me one at cassent5150@hotmail.com thanks. How important is matching on the output transistors? I'm talking about the two TO-3 package 2N301 and the two TO-36 package ECG213 transistors. I dont have a o-scope to match them but they do come in matched sets from NTE if its an absolute necessity. Thanks Steve C Steve C Report message to a moderator

Re: save a frank part 2 [message #14962 is a reply to message #14957] Tue, 28 December 2010 10:09   stevem Messages: 4733 Registered: June 2004 Location: NY Senior Member The matching is not crucial, but it will help the amp to make more wattage and cleaner watatge. all of the 6 TO3 transistors in a Frank head are 2n3055, or NTE131 ,or for more cost and more power you can use NTE181 for the four output transistors due to their higher gain factor. These two NTE transistor numbers can be had in a MP or matched pair form. I have a schematic, but do not have it scanded, may be Bill can blast you a email copy. Report message to a moderator

Re: save a frank part 2 [message #14970 is a reply to message #14962] Wed, 29 December 2010 01:26   cassent5150 Messages: 341 Registered: August 2009 Senior Member Hey stevem thanks for the info. This frank has only 5 transistors in the back panel. 3 TO-36 package (2=ECG213's and 1=HEP233 or NTE-105) with the center mounting post and the 2=2N301's. This never had six. I cant find a PC # on the board anywhere. Only ID I have is that its a C-495 two channels no effects model. Thanks Steve C Steve C Report message to a moderator

Re: save a frank part 2 [message #14972 is a reply to message #14957] Wed, 29 December 2010 10:09   stevem Messages: 4733 Registered: June 2004 Location: NY Senior Member My 1967 frank head has 6 TO3 transistors on the rear panel and the Schematic indeed calls for a total of 6, 4 outputs and 2 on the PC201 board which is the regulator board. Another thing that needs to be checked is how good the connection is on the pins of the those two TO3 transistors as they pass through the board and into the sockets. you need to dismount this board and pop the transistors in to make sure these connection points still have good tension on those pins. Report message to a moderator

Re: save a frank part 2 [message #14973 is a reply to message #14972] Wed, 29 December 2010 10:53   pleat Messages: 1452 Registered: June 2004 Location: Belding, Mi Senior Member Steve's C495 is a very model with only 5 transistors on the back. I'm guessing 1965 or older. I sent Steve a photo of the back panel of a C350 that only has 5 transistors. pleat Report message to a moderator

Re: save a frank part 2 [message #14978 is a reply to message #14973] Wed, 29 December 2010 18:58   cassent5150 Messages: 341 Registered: August 2009 Senior Member Thanks for the pics. Thats the one pleat. C-350 with the 5 transistors. Is there any way you can get a good shot of the preamp board so I can see whats missing? There is spots on both channels where things have been removed either by unsoldering or simply cut and I can still see the stubs sticking up from the board. Is that paper tag the only ID on that amp as well? Does that preamp have any ID # to tell what PC-board it is? Thanks Steve C Steve C Report message to a moderator

Re: save a frank part 2 [message #14979 is a reply to message #14978] Wed, 29 December 2010 19:14   pleat Messages: 1452 Registered: June 2004 Location: Belding, Mi Senior Member The pictures of the back of the C350 were sent to me from a guy in PA. I don't have any of the insides to help you out. Wish I did. pleat Report message to a moderator

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