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FOR SALE: Tandberg Troll replica DIY amplifier
FOR SALE: Tandberg Troll replica DIY amplifier
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Old 3rd August 2010, 06:33 PM   #1
wimdehaan is offline wimdehaan  Netherlands
diyAudio Member
Join Date: Sep 2004
Location: n/a
Default FOR SALE: Tandberg Troll replica DIY amplifier

FS: Tandberg Troll clone/replica amplifier, 2x mono, build after the original Tandberg circuit diagram. The custom made PCB has a nice feature, this because it can work with a double opamp and a single opamp. So you can use the original LF353 opamp, but also the audio grade LM4562 or OPA627, or a double audio opamp like the OPA2604 or OP275. This all using 2 jumpers (no soldering required). I believe the OPA627 is the best choice, but PCB uses a (high quality) IC socket, so opamp exchange is easily done.

Amplifiers work 100% correct, hum/noise is -80dB related to 1W, output power is approx. 35W into 4 ohm and same into 8 ohm. Distortion is conform Tandberg 0.06% at 1W. Weight of one mono is 3.4 KG. At switching on there is a slight not harmful thumb. No DC protection, or safety feature if you connect amplifier output to ground (why should you).

Amplifier comes with original LF353 opamp. But for a little more I can supply the OPA627 or LM49710 (metal housing) along with this amps.

Amplifier uses: ELNA for Audio main caps, ELNA Silmic caps, Nichicon MUSE ES caps (coupling) and silvermica for smaller caps.

Price for the 2 mono amps is 260 euro, a little more if you like the OPA627 or/and LME49710, or other.

Shipping costs may be calculated: I believe for most Europe countries it will be 25 euros upto 30 euros, but the US and for example Australia are something like 50 euros. Amps weight together 7 kg.

Please notice the photos show a PCB with groundplane (double sided PCB), but the actual amps as offered here are using a single layer, there is no difference in specs. The single layer uses a little trick that’s on the bottom / solder side of the PCB. Enclosure comes with top cover.

Payment can be done using PayPal.
Attached Images
File Type: jpg troll wim gnd plane 1.JPG (92.2 KB, 156 views)
File Type: jpg troll wim gnd plane 2.JPG (132.0 KB, 141 views)

Last edited by wimdehaan; 3rd August 2010 at 06:41 PM.
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