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ODDBLOCK Series 2

OddBlock Series Octal

The ODDBLOCK SERIES 2 OCTAL (OBS2OC) are a mono block amplifier. That means they are single channel and two kits will be needed for stereo operation. The OBS2 OCTAL can be used with a variety of octal base power tubes such as KT66, KT77, 6L6GC, EL34, 6CA7, 6550, KT88 and KT90’s with preferred tubes being the KT77, EL34 and KT88’s which we feel offer the best sonic performance. The OBS2 OCTAL use a single 12SL7GT type pre-amp tube.

Note: We do not recommend the use of ELECTRO-HARMONIX KT88 in these units.

The OBS2OC circuitry operates in pure class “A” mode. This mode of operation is forced by the use of a constant current source in the output stage. Current can be adjusted for different octal power tubes by simply flicking a switch inside on the PCB which is clearly marked. A feed back loop defeat switch is also provided on the PCB if you are a purist at heart. OBS2OC utilize a very low amount of feedback, generally 3-4 db so switching to feed back defeat position can be slightly heard. Low noise, low distortion and maximum bandwidth were foremost in the design of these amplifiers. Power output was secondary.

Most contemporary amplifiers seem to be involved in a horse power race. Bigger is better seems to be the mantra. Often sound quality in the lower power levels is sacrificed to get greater output. All OddWatt kits are designed to deliver optimum response at actual listening levels which are often only a few watts. Power output is modest but sufficient for most applications. The power ratings are conservative.

A feature that many will like is that when overdriven the amplifiers overload gracefully. There is no sudden massive distortion as is common in many solid state amplifiers. The OBS2OC comes complete with all parts to have a fully operating amplifier kit when completed including metal top cover shown.

Typical operational results if used with JJ KT77, EL34 or 6L6GC power tubes

Power output 15 watts RMS
- Distortion below 0.5% through half power, 1% at full power
- Frequency Response 8HZ to 20 KHZ +0/-1db at any rated power*
- Signal to noise better than 80 db
- Tubes JJ KT77, EL34 or 6L6GC, NOS 12SL7GT

* Typically below 0.3%

Typical operational results if used with JJ KT88 power tubes

- Power output 25 watts RMS
- Distortion below 0.5% through half power, 1% at full power*
- Frequency Response 8HZ to 20 KHZ +0/-1db at any rated power
- Signal to noise better than 80 db
- Tubes JJ KT88, NOS 12SL7GT

* Typically below 0.3%

PRICING

OBS2OC – One complete kit supplied without power tubes with one 12SL7GT pre-amp tube $550.00

OBS2OCJJEL34 – One complete kit supplied with JJ EL34 power tubes and one 12SL7GT pre-amp tube $600.00

OBS2OCJJEL34 BG – One complete kit supplied with JJ EL34 BLUE GLASS power tubes and one 12SL7GT pre-amp tube $615.00

OBS2OCJJKT77 – One complete kit supplied with either JJ KT77 power tubes and one 12SL7GT pre-amp tube $615.00

OBS2OCJJKT88 – One complete kit supplied with JJ KT88 power tubes and one 12SL7GT pre-amp tube $665.00

OBS2OCJJKT88BG – One complete kit supplied with JJ KT88 BLUE GLASS power tubes and one 12SL7GT pre-amp tube$695.00

TO ORDER ONE OF THE ABOVE KITS send us an email at sales@oddwattaudio.com stating the product you would like from the list above. Include the product code of your choosing such as "OBS2OCJJKT88" in your email. Please state the amount you would like and include your shipping address so we can quote shipping for you and give you a total cost.
ACCEPTED PAYMENT TYPES - ODDWATT is unfortunately unable to take direct credit card payments however we accept PayPal, direct money transfers or checks or money orders from major US banks. Please specify how you would like to pay in your email. We do charge the customer applicable fees on PayPal and direct money transfers. We are happy to answer any questions you may have about our products or application of our products. Questions can be sent also to sales@oddwattaudio.com. GOOD LISTENING - OddWatt