MKI Screeching noise?
Moderator: The Captain
- mam8dg
- Posts: 1016
- Joined: Tue Nov 10, 2009 6:03 pm
- Location: Rochester, NY
Re: MKI Screeching noise?
To echo what others have said, that is pretty normal for the decay of a MK1.
migsmoon.bandcamp.com
- Nostalgia
- Posts: 95
- Joined: Mon Dec 23, 2013 2:05 am
- Location: USA
Re: MKI Screeching noise?
With 8nf cap from input to ground. Changed the tone a bit. Will try lower cap maybe 3nf-5nf.
- Electric Warrior
- Posts: 3620
- Joined: Sun Nov 09, 2008 2:19 am
Re: MKI Screeching noise?
Maybe try a slightly bigger resistor between Q2B and -9V. What did you use there?
Everything is transitional.
- Nostalgia
- Posts: 95
- Joined: Mon Dec 23, 2013 2:05 am
- Location: USA
Re: MKI Screeching noise?
I used 2k2 and 280k on Q2 base and 2k2 on Q2C. Maybe my gain transistors are low side? Q1 60hfe, Q2 95hfe and Q3 80hfe.Electric Warrior wrote:Maybe try a slightly bigger resistor between Q2B and -9V. What did you use there?
- Electric Warrior
- Posts: 3620
- Joined: Sun Nov 09, 2008 2:19 am
Re: MKI Screeching noise?
Gains should be fine. I fixed my screeching noise problem (far worse than yours) by using a bigger resistor. Try a 330k instead of the 280k. That might be enough.
They used quite a range of different resistor values in that spot in vintage units...
They used quite a range of different resistor values in that spot in vintage units...
Everything is transitional.
- Nostalgia
- Posts: 95
- Joined: Mon Dec 23, 2013 2:05 am
- Location: USA
Re: MKI Screeching noise?
Well that's true. Mine does not screech at all when I reaches above -6v on Q2C or -9.2v on Q3C. But I don't like the tone and feel when it goes above -4.5v. I try to bias mine around -1.5 to 3.3v at Q2C.Electric Warrior wrote:Gains should be fine. I fixed my screeching noise problem (far worse than yours) by using a bigger resistor. Try a 330k instead of the 280k. That might be enough.
They used quite a range of different resistor values in that spot in vintage units...
- anemochore
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Re: MKI Screeching noise?
This sounds greatNostalgia wrote:With 8nf cap from input to ground. Changed the tone a bit. Will try lower cap maybe 3nf-5nf.
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