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Vintage Asylum: RE: Restoration by rickl Classic gear from yesteryear; vintage audio standing the test of time. |
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Vintage Asylum: RE: Restoration by rickl Classic gear from yesteryear; vintage audio standing the test of time. |
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134.242.133.1
In Reply to: RE: Restoration posted by Lee of Omaha on April 14, 2022 at 18:28:26:
> I just took a look at the schematic. It seems to be a pretty normal
> integrated amp. At first glance I saw nothing out of the ordinary.The problem with the 250/240/250M family is when the outputs fail, they take out the speaker relay and start eating back to the diff pairs. DC coupled has it fans but...
All transistors are suspect and need to be tested. And all the collector resistors and emitter resistors. there is always a lot of failed components.
I've been able to get modern equivalents for the transistors but it is a lot of work. Mouser has (or had) replacement PS caps too (shorter but same diameter screw tops).
I say 'never again' and keep getting them on my bench. I think I've fixed at least 5.
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Topic - Marantz 1250 - catbert242000@yahoo.com 16:24:47 03/11/22 ( 37)
- My Marantz 1250 - Alex F. 13:45:00 03/29/22 ( 0)
" I have a nice 2238b, but the extra power might be fun" - 1973shovel 07:31:58 03/14/22 ( 19)
- it says PRE OUT - Story 16:26:54 03/14/22 ( 3)
- No sliders in the 2238b (nt) - Triode_Kingdom 17:17:32 03/14/22 ( 2)
- The 2238b: - J. S. Bach 10:04:24 03/15/22 ( 1)
- it's a pretty thing - Story 10:15:55 03/15/22 ( 0)
RE: " I have a nice 2238b, but the extra power might be fun" - catbert242000@yahoo.com 15:55:20 03/14/22 ( 10)
- RE: " I have a nice 2238b, but the extra power might be fun" - airtime 06:47:49 03/15/22 ( 9)
- "The 1250 has is a combo of a Marantz 3600 preamp and 250 power amp" - 1973shovel 04:57:06 03/16/22 ( 8)
- RE: "The 1250 has is a combo of a Marantz 3600 preamp and 250 power amp" - airtime 07:08:00 03/16/22 ( 7)
- Yeah, that too - 1973shovel 08:23:53 03/16/22 ( 6)
- My 250M is going to stay with me until the end - airtime 14:40:20 03/16/22 ( 2)
- They say... - 1973shovel 06:43:33 03/17/22 ( 0)
- RE: My 250M is going to stay with me until the end - Coner 19:27:43 03/16/22 ( 0)
- RE: Yeah, that too - Coner 12:35:42 03/16/22 ( 2)
- Actually, not level controls....meter range switches. - Coner 14:20:50 03/20/22 ( 0)
- Right - 1973shovel 07:05:30 03/19/22 ( 0)
That's an excellent suggestion! ( nt ) - Triode_Kingdom 14:24:08 03/14/22 ( 3)
- I don't know if it's the best sonic suggestion - 1973shovel 05:06:00 03/16/22 ( 2)
- " the best sonic suggestion " - Triode_Kingdom 07:59:50 03/16/22 ( 1)
- I was going to say the same thing - 1973shovel 08:35:59 03/16/22 ( 0)
RE: Marantz 1250 - airtime 18:15:50 03/11/22 ( 15)
- RE: Marantz 1250 - geoff 08:45:57 03/12/22 ( 14)
- Restoration - Triode_Kingdom 10:32:53 03/12/22 ( 13)
- RE: Restoration - Lee of Omaha 18:28:26 04/14/22 ( 3)
- RE: Restoration - rickl 04/18/22 11:01:22 04/18/22 ( 1)
- On DC coupling... - Lee of Omaha 18:12:46 04/18/22 ( 0)
- RE: Restoration - dbphd 02:20:43 04/16/22 ( 0)
- RE: Restoration - geoff 10:53:55 03/12/22 ( 8)
- RE: Restoration - Triode_Kingdom 15:22:08 03/12/22 ( 6)
- Deoxit Fader Grease - Story 12:38:13 03/13/22 ( 0)
- Deoxit Type F - Bill Way 03:40:23 03/13/22 ( 4)
- RE: Deoxit Type F - Triode_Kingdom 12:29:01 03/13/22 ( 2)
- RE: Deoxit Type F - Coner 14:30:08 03/13/22 ( 1)
- RE: Deoxit Type F - Triode_Kingdom 19:51:28 03/13/22 ( 0)
- thanks for the info - Story 05:08:56 03/13/22 ( 0)
with shipping you're lookin at just over a grand if lucky nt/ - Story 11:42:29 03/12/22 ( 0)
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