[tropicana]

Has anyone heard this?
 

 

[whirlwind]

NO...but I sure would love too.

 

[tropicana]

Anyone?

 

[johno99]

I have not heard one, but like that the owners manual is available for download and includes the schematic.

 

[Haidar]

Nice article here
http://www.wallofsound.ca/uncategorized/mapletree-audio-line-2b-se-preamplifier-with-rm1-remote-using-bent-audio-motorized-alps-potentiometer/

 

[Haidar]

New review here:
 
http://headphone.guru/the-mapletree-audio-sugarmaple-od300-headphone-amplifier-one-smooth-player/

 

[Andrew Rieger]

Bumping this thread because this thing looks cool. Any new impressions? 
 
Some additional product info:
 
Company Site: https://hollowstate.netfirms.com/#headphone amps

Review: http://headphone.guru/the-mapletree-audio-sugarmaple-od300-headphone-amplifier-one-smooth-player/

Manual: https://hollowstate.netfirms.com/manuals/OD300 Users Manual.pdf

Specs: https://hollowstate.netfirms.com/resources/Mapletree Headphone Amplifier Comparison.html

 

 

[Jimmyblues1959]

Bumping this thread because this thing looks cool. Any new impressions?

Some additional product info:

Company Site: https://hollowstate.netfirms.com/#headphone amps

Review: http://headphone.guru/the-mapletree-audio-sugarmaple-od300-headphone-amplifier-one-smooth-player/

Manual: https://hollowstate.netfirms.com/manuals/OD300 Users Manual.pdf

Specs: https://hollowstate.netfirms.com/resources/Mapletree Headphone Amplifier Comparison.html

Bumping this thread as I just purchased a Mapletree Sugarmaple Octal Duo 300. These amplifiers are custom made in Canada, by Dr. Al Freundorfer. From what I have seen, they rarely come up for sale on the used market. For example, in the two years that I have been looking for one I have seen only two for sale. A Sugarmaple Octal Duo OTL on Canuck Audiomart in 2020 which was sold by the time I tried to purchase it, and the Octal Duo 300 SET that I just purchased this past week, which was only on Canuck Audiomart for two days. Still awaiting delivery, but I will post in regard to this headphone amplifier once it arrives. It is a very neat piece of hifi gear that should synergize quite well with my higher impedance dynamic headphones.

 

[Jimmyblues1959]

I have had my Mapletree Sugarmaple OD 300 for a few weeks now and find it to be a fine sounding headphone amplifier. It works quite well with my AKG K240 Sextetts which are 600 ohms, as well as my Sennheiser HD 600's (300 ohms).

What came as a pleasant surprise is how nicely my planars sound with the OD300, even though it
appears to have been designed to work best with higher impedance dynamic headphones.

Being a pure Class A design, the OD 300 runs quite hot, which will limit its use to the cooler months of the year.

Waited two years to find a used one of these rare headphone amplifiers (only 10 were ever built) and it was worth the wait.

 

[Jimmyblues1959]

Update: 5/26/2023 - I emailed Al Freundorfer who now oversees Mapletree Audio. He told me about a new headphone amplifier that
he offers which includes both the OD300 SET circuit and OTL circuit in one chassis for greater flexibility , along with a tone control dubbed mellow boy, which allows you to contour the sound. The power supply comes in a separate chassis. Price is $1200, which IMO is very reasonable for a bespoke audio component that uses quality parts.

Earlier...

I have had my Mapletree Sugarmaple OD 300 for a few weeks now and find it to be a fine sounding headphone amplifier. It works quite well with my AKG K240 Sextetts which are 600 ohms, as well as my Sennheiser HD 600's (300 ohms).

What came as a pleasant surpriseis how nicely my planars soundwith the OD300, even though it
appears to have been designed to work best with higher impedance dynamic headphones.

Being a pure Class A design, the OD 300 runs quite hot, which will limit its use to the cooler months of the year.

Waited two years to find a used one of these rare headphone amplifiers and it was worth the wait.

Update: 5/26/2023 - I emailed Al Freundorfer who now oversees Mapletree Audio. He told me about a new headphone amplifier that
he offers which includes both the OD300 SET circuit and OTL circuit in one chassis for greater flexibility, along with a tone control dubbed mellow boy, which allows you to contour the sound. The power supply comes in a separate chassis. Price is $1200, which IMO is very reasonable for a bespoke audio component that uses quality parts.

 

[Jimmyblues1959]

Update: 5/26/2023 - I emailed Al Freundorfer who now oversees Mapletree Audio. He told me about a new headphone amplifier that
he offers which includes both the OD300 SET circuit and OTL circuit in one chassis for greater flexibility, along with a tone control dubbed mellow boy, which allows you to contour the sound. The power supply comes in a separate chassis. Price is $1200, which IMO is very reasonable for a bespoke audio component that uses quality parts.

Al sent me some photos of his latest headphone amplifier, which I have posted below. The one with the wood sides is the OD300/OD OTL, which retails for $1200; it's basically two headphone amplifiers in one chassis plus the power supply in the second chassis. It also has the "mellow boy" tone control feature that is available with the original Octal Duo OTL headphone amplifier. The second amplifier is the OD300/OD OTL/3 WPC power amplifier. Please contact Al at the Mapletree Audio Website for the price of the power amp version. This version can also have a subwoofer output installed.
https://www.mapletreeaudio.com/