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Old 7th June 2010, 08:20 AM   #41
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Quote:
Originally Posted by zeonrider View Post
550 W with + /- 65 V dc

Regards zeoN_Rider
If amplifier output power is most important to you, see post #8, no need for those smiles,
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Old 7th June 2010, 09:01 AM   #42
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Old 'RCA' is very valuable parts,
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Yes, but i have only 5 of them. Used - but working o.k. in testing circuit as constant current source.

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Old 7th June 2010, 11:38 AM   #43
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Yes, but i have only 5 of them. Used - but working o.k. in testing circuit as constant current source.

regards

frank
That's enough for 2X120W/4R amp, and you have one for service
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Old 7th June 2010, 12:33 PM   #44
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Quote:
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If amplifier output power is most important to you, see post #8, no need for those smiles,
Regards
OK, no smiles !

Click the image to open in full size.

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Old 7th June 2010, 01:25 PM   #45
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Ilich Ramírez Sánchez ,
Thank's for your contribution in DIY

Last edited by apexaudio; 7th June 2010 at 01:30 PM.
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Old 8th June 2010, 10:13 AM   #46
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Default Sch

B550 Schematic
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File Type: jpg Apex 550W classB sch.jpg (192.2 KB, 2298 views)
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Old 8th June 2010, 10:18 AM   #47
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For rail voltage over +/-65V DC, BC546 must be replaced with 2N5551 (reversed pins!), 2N3773 must be replaced with MJ15024 and MJE15031/MJE15030 with MJE15032/MJE15033.

Last edited by apexaudio; 8th June 2010 at 10:20 AM.
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Old 8th June 2010, 11:05 AM   #48
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Crown DC300A used four pair 2N3773 on ±65V for 300W/4R x 2 (1.5KVA transformer).

2N3773 150W SOA at 70V, 150W at 100V (±70V rails max)
MJ15024 160W SOA at 80V, 100W at 100V
MJ21196 240W SOA at 80V, 200W at 100V
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Old 8th June 2010, 11:06 AM   #49
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post46.
surely not, not even for ClassB.

The output to VAS cap?
The missing Re on output?
The missing driver emitter load?
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Old 8th June 2010, 11:23 AM   #50
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Quote:
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Crown DC300A used four pair 2N3773 on ±65V for 300W/4R x 2 (1.5KVA transformer).
That what I talking about!

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