I have a couple of questions about the front panel on some ODS amps.
1. What is the 'Accent' switch for? and where might it reside in the available schematics?
2. What does the 'Ratio' pot on the OD section actually do?
Sorry if these seem relatively inane, but they have been floating around in my head for some time.
Thanks,
Andy
Front Panel Questions...
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Re: Front Panel Questions...
1) It puts a 2.2uF, 35V capacitor across the tail resistor to bypass some of the negative feedback to ground, boosting the mids and highs. (Like a fixed presence control.)
2) It controls how much of the output of the output of V2A is fed into V2B (same thing as the drive control). Dumble used several different names for these controls over the years.
2) It controls how much of the output of the output of V2A is fed into V2B (same thing as the drive control). Dumble used several different names for these controls over the years.
Re: Front Panel Questions...
Eventhough Oldmac man answered the ratio question, here is an interview from GP with HAD where he mentions the ratio control. The whole interview is interesting.
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Re: Front Panel Questions...
Actually the Ratio control is after V2B, it's the volume of the OD channel before it gets into the global master volume, it lets you adjust the balance (ratio) of volume with the clean channel.oldmacman wrote: 2) It controls how much of the output of the output of V2A is fed into V2B (same thing as the drive control). Dumble used several different names for these controls over the years.
The Drive control is the one between V2A and V2B.
Later models having two separate masters (clean and OD) have this control renamed Volume.
Teo