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Project Sunrise III

post #1 of 9
Thread Starter 

Source: http://www.garage1217.com/graphic_design_013.htm



She is almost here! We have kept the update a secret for sometime now. Project Sunrise and Horizon are entering into a version III! We have listened closely over the years to what customers would like to have added to these designs and we have made it so. No worries - at heart she is the same amplifier, producing the same sound that has made her quite the seller and loved globally. New features include...


  • Variable input gain with changeable gain module for custom values (very important when mating equipment and sources) Finally no more fixed gain! Dial it in per the equipment you own
  • Line output disconnect. So when headphones are plugged in, the line out is disconnected for reduced noise - increased performance (this can be easily defeated if one uses the amplifier as a pre-amp and headphone amplifier simultaneously)
  • Added in an extra output resistance setting which bypasses the resistors totally
  • Output resistance changes now affect the line-out / pre-out
  • Revised protection circuitry
  • Power and protection LED indicators
  • New and improved layout yet still closely resembles the original
  • New chassis design, again closely resembles the original

More info, photos and user manuals to come! Sunrise III will officially start shipping late next week. Any orders placed now for a Sunrise II, will receive the new Sunrise III.

post #2 of 9
Thread Starter 

OMG!!! check it out the new project horizon 3 & sunrise 3 are out on garage1217's website!!!!!!


project sunrise 3: http://www.garage1217.com/garage1217_diy_tube_headphone_amplifiers_002.htm

 New features of Sunrise III
  • 3 Output resistance settings
  • Revised layout
  • Line-out bypass (when headphones are plugged in)
  • Variable input gain with easy to swap gain module
  • Revised protection circuit with LED indication

project horizon 3: http://www.garage1217.com/garage1217_diy_tube_headphone_amplifiers_003.htm

 New features of Horizon III:
  • Revised layout
  • Line-out bypass (when headphones are plugged in)
  • Variable input gain with easy to swap gain module
  • Revised protection circuit with LED indication


edit: hahaha... I'm pretty excited about this! would love to hear impressions of the newer models :)

Edited by money4me247 - 12/24/13 at 4:09am
post #3 of 9
I built a PSIII for Christmas to use with my Grado SR225i, and so far, I really like it.
It definitely takes away some of the Grado harshness
post #4 of 9

Anyone else have this amp? I just got mine about 2 weeks ago. I am really liking it however i do have a few issues with it. Mostly with the included tube JJ E88CC  and my ATH-AD900X.


I don't know much about tube as this is my first foray into tube amps but i think this is a high gain tube as my AD900X get very loud very fast.


I had to turn my input down to about 20% to be able to listen comfortable with the amp's pot past the recommended 9'o clock position. With that i find bass to be a bit lacking, mids really forward and lush highs crystal but a bit piercing on some tracks. 


Not sure if i should get a different tube or if an inline resistor would do anything.  



foobar2000 (WASAPI) > Hifimediy Sabre DAC > Project Sunrise III (JJ E88CC) > ATH-AD900X 

post #5 of 9

My Sunrise III is currently on its way. I was going to use it with the ATH-AD900X headphones but Jeremy from Garage 1217 suggested that I might have to use an attenuator or lower the volume at the source (for example PC volume out) in order to have comfortable room on the volume knob to regulate the volume. The ATH-AD900X has a low impedance and high efficieny and would not really need an amp. I have since sold the ATH-AD900X  and purchased an Sennheiser HD650. I post my impressions with the HD650 and the Sunrise III later. 

post #6 of 9
my Sunrise III is stuck in Irish Customs for the last 3 days...mad.gif
post #7 of 9

The Sunrise III arived yesterday. Mine has Serial Nr.18 and I ordered it with GE Smoked Glas 6DJ8 vintage tube. Jeremy suggested that tube for my HD650.

The built quality is absolutely fantastic, have a look:







post #8 of 9

What is not very clear to me, can I use the Sunrise III as a Tube Buffer Stage, like the Ember? 


Edit: got my answer, it is, a buffer with the volume control enabled

Edited by roamling - 5/26/14 at 11:03am
post #9 of 9

@Nightmistx22 , did you try bypassing the input cap? 


Q to anyone/everyone who may know.  What I can't figure out is why this is called a 'hybrid' amp.  It's OTL.  Does it have a solid-state input stage?



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