Today I was scared to death since the left side of my HF2 stopped working. Turns out after some testing with other sources/amps, I have narrowed it down to a problem with the dynalo. I am not a DIY guy, so I have absolutely no skill in this sort of matter on how to repair or finding the cause. If anyone can assist me please let me know. Here are a few pics of the amp. The amp also has a slight burnt smell to it, however I do not know if this is normal or where in the amp it is coming from.




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Scared to death grado HF2 and Dynalo problems!
- Thread starter ivanrocks321
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Pars
Can Jam '10 Organizer
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Do you have a multimeter (DMM)? If so, with the volume control set to minimum and no phones connected, measure the R and L channel DC offset. To do this, set the meter fo DC volts, place the black lead on ground, and the red lead on L output and then R output and note the readings. You should be able too get at these on the Neutrik output jack (black wire = ground, I would assume red = R chan and green = L chan). These should be very close to 0V. If they are (and the meter is not auto-ranging), set the meter to DC mV and repeat the measurements.
Until you check this I would not plug your Grados or any other low impedance headphone into this amp.
Until you check this I would not plug your Grados or any other low impedance headphone into this amp.
FallenAngel
Headphoneus Supremus
I've never seen a Dynalo board like that before; it's certainly not the djgardner board. Anyway, measure DC offset as Pars suggested and start looking for components that get hot or look burned. Post findings.
penger
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Re-cased headamp gilmore lite?
MisterX
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The Gilmore V2 was sold either as finished amps or kits back before all of the ruckus about group buys happened.

Pars
Can Jam '10 Organizer
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Those aren't Gilmore V2 boards (my home Dynalo is built on a V2 board). The V2 board has both channels and the original Gilmore PSU with the OPA548Ts on a single board. These PCBs are more like GS-1/GS-X boards, but aren't even exactly that (they are marked as Monoboard V2.0).
GS-1/GS-X board:
http://www.headamp.com/home_amps/gs1...module_med.jpg
Gilmore lite:
http://www.headamp.com/home_amps/lit..._board_med.jpg
GS-1/GS-X board:
http://www.headamp.com/home_amps/gs1...module_med.jpg
Gilmore lite:
http://www.headamp.com/home_amps/lit..._board_med.jpg
jinp6301
Headphoneus Supremus
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IIRC from the original sale ad, this was built on an older version GLite board.
And ditto on the multimeter.
And ditto on the multimeter.
Looks like a "Gilmore V1" that was built as a kit
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