Front Panel Questions...

[v00d00blues79]

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

[oldmacman]

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.

[Robert]

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.

[llemtt]

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.

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.

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