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    Building, troubleshooting and testing of these amplifiers should only be
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    the safety precautions around high voltages.

Triode or ultraliner connected ?

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artosalo

artosalo

Member
Joined 2010
OTL tube amplifier with one output pentode but capable to feed 3 W to 4 ohms loudspeaker. Interesting, but hardly true.
I suppose that it is an ordinary SE amplifier. There is clearly a transformer box at the rear part of the chassis.
 
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ingenieus

Member
Joined 2011
Looks like OTL, from the manufacturer's website. It makes the following bold claim.

After many years of repeated tests and improvements our OTL technology gives a true sound and is among the finest available on the market today. After many years of repeated tests and improvements our OTL technology gives a true sound and is among the finest available on the market today.
Hartung OTL
Click to expand...
Only four tubes for a stereo amp? The outputs are 6P1P-EV Russian military(!) tubes. The driver/splitter tubes are 6S4P-EV military tubes (in pure single triode, whatever that implies).

Hard to tell what is in the box behind the tubes but judging by the size of the output posts in the picture it is not very big, Unlikely that there could be two output transformers and a power transformer in there but who knows? Also there are no taps for 4, 8, 16 ohms like OPTs usually have. The speaker outputs are rated for 4 ohm, as stated on the website.
 
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dovla

Member
Joined 2010
ebay link not OTL

Ebay link shows SE amp with 6P1P-EV tubes and those can't make 3W in triode connection (if EL84 makes some 1.5W in triode these can only be less) so it's either UL or plain pentode (perhaps with Shade feedback)

OTL link on vendor's own site shows rather beefy 4x6c33c monoblocks and those do make sense but have nothing to do with the amp OP inquired about
 
TheGimp

TheGimp

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Joined 2009
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michaelsamra

Member
Joined 2006
artosalo said:
OTL tube amplifier with one output pentode but capable to feed 3 W to 4 ohms loudspeaker. Interesting, but hardly true.
I suppose that it is an ordinary SE amplifier. There is clearly a transformer box at the rear part of the chassis.
Click to expand...

This is his ad so that is what I was going by.


Item specifics
Condition:
New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is ... Read moreabout the condition
Type: Power Amplifier
RMS Power: 2x3 W Number of Channels: 2
Channels: 2 x 1 Channel Brand: Hartung
Speaker Outputs: 2 Model: Output Transformerless
RMS Wattage: 3 Watt /4 Ohm/ each Audio Inputs: Stereo L/R RCA
Hartung classic tube amplifier: SE Number of L/R RCA Inputs: 2
Hartung: CD or Mp3 stereo all purpose amp Audio Outputs: Banana Speaker Jacks
 
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