[electronguy]

My 2006 (?) HR Desktop Portable amp + DAC has a 4.5-6V input on the back for the 4-D battery brick. I'd like to use a rechargeable lead-calcium 6V battery and was considering putting a 3A diode in series with a fuse and positive lead of the battery to drop the open-circuit voltage of the fully charged battery to about 6V even (on-par with 4-D cells). However, it would be nice to not have to lose that bit of juice.

I recall reading over the past couple of years as I've been browsing your website that at one point HR used Cosel DC-DC converters. From all the specs I can see on the DC-DC converters (I even have one in a homemade amp I built) they operate 4.5V to 9V, so a 6V SLA secondary battery seems like it would be okay.

For reference, I purchased the HR Desktop Portable + DAC just before your 2007 release of the rechargeable version.

Thanks for your input,

Scott