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Re: 5 Transistor Frank Schematic Needed [message #15079 is a reply to message #15052]

Wed, 12 January 2011 15:22

stevem
Messages: 4772
Registered: June 2004
Location: NY

Senior Member

To simplifie things you can replace PNP transistors with NPN types like the classic 2N3055, all you need to do is reverse the V+ and V- conections on the transistors.
If you are also converting from Germainium to a silicon type(once again like a 2N3055/NTN131/NTN181)you will also have to rebias the transistors by changing out the 4 wire wound ceraimic type resistors with a different valve to produce more bias volatge.
With out rebaising you will hear a distorted ending to each note played due to crossover distortion.
You can directly install the NPN types with out fear once rewired as they will be idling very cold, hence the crossover distortion problem.

[Updated on: Wed, 12 January 2011 15:24]

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[Message index]

		5 Transistor Frank Schematic Needed By: cassent5150 on Sun, 09 January 2011 14:18
		Re: 5 Transistor Frank Schematic Needed By: stevem on Sun, 09 January 2011 16:10
		Re: 5 Transistor Frank Schematic Needed By: cassent5150 on Mon, 10 January 2011 09:40
		Re: 5 Transistor Frank Schematic Needed By: chicagobill on Mon, 10 January 2011 12:32
		Re: 5 Transistor Frank Schematic Needed By: cassent5150 on Tue, 11 January 2011 04:20
		Re: 5 Transistor Frank Schematic Needed By: conductortom on Tue, 11 January 2011 08:30
		Re: 5 Transistor Frank Schematic Needed By: cassent5150 on Tue, 11 January 2011 09:31
		Re: 5 Transistor Frank Schematic Needed By: conductortom on Tue, 11 January 2011 10:12
		Re: 5 Transistor Frank Schematic Needed By: cassent5150 on Tue, 11 January 2011 12:07
		Re: 5 Transistor Frank Schematic Needed By: conductortom on Tue, 11 January 2011 12:19
		Re: 5 Transistor Frank Schematic Needed By: chicagobill on Tue, 11 January 2011 12:41
		Re: 5 Transistor Frank Schematic Needed By: cassent5150 on Tue, 11 January 2011 14:16
		Re: 5 Transistor Frank Schematic Needed By: conductortom on Tue, 11 January 2011 15:34
		Re: 5 Transistor Frank Schematic Needed By: cassent5150 on Tue, 11 January 2011 17:48
		Re: 5 Transistor Frank Schematic Needed By: conductortom on Tue, 11 January 2011 18:04
		Re: 5 Transistor Frank Schematic Needed By: cassent5150 on Tue, 11 January 2011 20:46
		Re: 5 Transistor Frank Schematic Needed By: stevem on Wed, 12 January 2011 15:22
		Re: 5 Transistor Frank Schematic Needed By: cassent5150 on Wed, 12 January 2011 19:57
		Re: 5 Transistor Frank Schematic Needed By: stevem on Sat, 15 January 2011 11:34
		Re: 5 Transistor Frank Schematic Needed By: cassent5150 on Sat, 15 January 2011 16:57
		Re: 5 Transistor Frank Schematic Needed By: cassent5150 on Sun, 16 January 2011 10:30
		Re: 5 Transistor Frank Schematic Needed By: conductortom on Sun, 16 January 2011 11:16
		Re: 5 Transistor Frank Schematic Needed By: stevem on Sun, 16 January 2011 13:56
		Re: 5 Transistor Frank Schematic Needed By: cassent5150 on Sun, 16 January 2011 18:19
		Re: 5 Transistor Frank Schematic Needed By: conductortom on Sun, 16 January 2011 20:56

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