Teaser of new Single Ended OTL Tube Power Amp Monoblocks

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Wolf Ear Audio

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Here's a quick teaser pic of my new amp I will be releasing soon :)
These are going to be a very nice sounding amp with plenty of current and pure single ended bliss, though they are going to be quite heavy and about an inch taller than the Kitoki V2.
Each mono-block uses one 6DJ8 (6N1P-EV) for the driver tube and five 6L6 (6N3S) for the output tubes.
Output power is about 5 watts into 8 ohms and 9 watts into 16 ohms.
Gain is about 10 (+20db).

I only have the one amp built at the moment, but once I finish up the matching pair and get some new photos taken I will have it listed and available (very easy for me now that I have a new camera and portable photo studio!)

tdinut

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Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #1 on: 26 Mar 2019, 05:38 am »
Wow!


What a cool amp. Can’t wait for more updates.

FullRangeMan

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Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #2 on: 26 Mar 2019, 09:20 am »
Great product congratulations.
What other output tubes can be used?
It is possible use 6N2P as input tube?

Wolf Ear Audio

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Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #3 on: 26 Mar 2019, 04:32 pm »
Great product congratulations.
What other output tubes can be used?
It is possible use 6N2P as input tube?
For the output tube, you can use 6L6, EL34 or KT88 types (amp is shipped with Russian NOS equivalents to the 6L6, the 6N3S).
The biggest effect on sound is the driver tube in this design and you can use either the 6DJ8, 6N1P-EV or 6N6P (6DJ8 is my fave here).
The 6N2P tube unfortunately would not work here and would very quickly die from the high current.

15invo

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Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #4 on: 26 Mar 2019, 06:22 pm »
nice!!

so 9watt > 16ohm? 
     4ohm>  5 watts ?
   

    gain x10
    input impedance ?

    looking forward for more pics !

thx

Wolf Ear Audio

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Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #5 on: 26 Mar 2019, 06:50 pm »
nice!!

so 9watt > 16ohm? 
     4ohm>  5 watts ?
   

    gain x10
    input impedance ?

    looking forward for more pics !

thx
I was gonna wait to release full specs, but these are what they will look like at the moment (unless something major changes, this will be the way it stays)
Specs:
Output Power: 9w@16ohms, 5w@8ohms and 2.5w@4ohms
Input Impedance: 100K ohms
Output impedance: about 1 ohm
Gain: 10 (+20dB)
Input tube: 6N1P-EV (6DJ8 and 6N6P also compatible)
Output tubes: Five 6N3S (6L6, EL34 and KT88 types also compatible)
Weight: ~25lbs
Dimensions: 320mm(W) x 220mm(L) x 105mm(H)

More pics to come :)

15invo

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Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #6 on: 26 Mar 2019, 07:31 pm »
great thanks !

what about input sensitivity ?  :)
 

Wolf Ear Audio

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Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #7 on: 26 Mar 2019, 08:04 pm »
great thanks !

what about input sensitivity ?  :)
About 1-2V will drive it to full power, which should be fine even with passive preamps. I designed it that way so that it would play very nice with the Piksii preamp I carry, which doesn't add any voltage gain (but adds plenty of current gain).

FullRangeMan

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Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #8 on: 27 Mar 2019, 09:33 am »
For the output tube, you can use 6L6, EL34 or KT88 types (amp is shipped with Russian NOS equivalents to the 6L6, the 6N3S).
The biggest effect on sound is the driver tube in this design and you can use either the 6DJ8, 6N1P-EV or 6N6P (6DJ8 is my fave here).
The 6N2P tube unfortunately would not work here and would very quickly die from the high current.
Thanks for inform. The 5th 6L6 is a regulator tube or the output tubes set are five indeed?

borism

Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #9 on: 27 Mar 2019, 02:13 pm »
Just a side observation.I tried to look up the Russian '6N3S' tube and discovered a possible translation issue. The 6L6 equivalent seems to be the Russian '6P3S'. This would make sense since the Cyrillic 'n' is actually a 'P'.

Wolf Ear Audio

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Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #10 on: 27 Mar 2019, 02:23 pm »
Thanks for inform. The 5th 6L6 is a regulator tube or the output tubes set are five indeed?
No regulator tubes here, all five are used in the output. This was just the best way for me to fit everything on the top plate and keep it the same size as my other products :)

FullRangeMan

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Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #11 on: 28 Mar 2019, 12:17 am »
Looks a great sound amp :thumb:
The tubes are inexpensive to retube.

15invo

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Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #12 on: 30 Mar 2019, 06:51 pm »
is this amp load sensitive ?

can it drive 4ohm nominal but efficient speakers effectively or it's more advised for 8ohm + ?

thanks

FullRangeMan

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Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #13 on: 31 Mar 2019, 09:22 am »
Would this ''efficient'' be greater than 100dB?

15invo

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Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #14 on: 28 Apr 2019, 09:20 am »
Hi ,

anything new regarding the mono amps?

Wolf Ear Audio

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Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #15 on: 7 May 2019, 05:26 pm »
Hi ,

anything new regarding the mono amps?
Yes, sorry. I had a surgery and was away from work (mostly) for a couple weeks but I am back now. I just finished up the other one for the pair and will be doing some testing over the next couple days and then take some new photos. It should all be done and new product page up this weekend *fingers crossed* :)

As for your other question, anything above 90db@1W for 4 ohms will work well and anything 88db@1w or more efficient will work well for 8 ohm speakers (this is all assuming your room isn't gigantic)

bladesmith

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Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #16 on: 7 May 2019, 06:21 pm »
 :popcorn:

Shogun

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Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #17 on: 7 May 2019, 08:53 pm »
Single ended isn't suppose to mean one output tube per channel?

What about the price? The power consumption per monoblock?

Wolf Ear Audio

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Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #18 on: 7 May 2019, 09:54 pm »
Single ended isn't suppose to mean one output tube per channel?

What about the price? The power consumption per monoblock?
Single ended means it uses a single signal per channel (usually an RCA connection) while balanced amps will have a positive and negative signal as well as a ground reference per channel (usually XLR inputs).
This amp has one signal tube and five output tubes per channel and will be about 1K USD per monoblock :)
Power consumption is about 175 watts.

audio.bill

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Re: Teaser of new Single Ended OTL Tube Power Amp Monoblocks
« Reply #19 on: 7 May 2019, 10:03 pm »
Single ended isn't suppose to mean one output tube per channel?
The phrase "single ended" in regards to power amplifiers is in contrast to more commonly used push-pull designs. While a single output tube can be used in purist single ended designs, they are very limited in power due to inherent power capacity of a single tube operated in such a manner. So it is common to use multiple output tubes in parallel which provide higher power output while still being single ended in operation as opposed to push-pull.