ThetaPower Amplifierused1/pr Theta Tube Mono Power Amplifiers in excellent condition, extensively modified.This listing is for a tested and guaranteed to work correctly, hard to find pair of Theta monobloc tube Power Amplifier's in very good condition. 60wpc. These have had the bias meters and pots remo...1900.00

1/pr Theta Tube Mono Power Amplifiers in excellent condition, extensively modified.

Listing ID: lisa9651 Classified 
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soundideasflorida 

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Condition
8/10
Payment methods
Ships fromGainesville, FL, 32609
Ships toUnited States
Package dimensionsunspecified
Shipping carrierFedEx
Shipping cost$160.00
AverageResearch Pricing

This listing is for a tested and guaranteed to work correctly, hard to find pair of Theta monobloc tube Power Amplifier's in very good condition. 60wpc. These have had the bias meters and pots removed to shorten the signal path along with many other mods we will be listing below in this ad. These are a sequentially numbered set, serial numbers 267 & 268. Fresh GT6550R output tubes. a real bargain at $1900.00


From our consignee describing the upgrades:


"A quad set of GT6550R tubes,
premium gold contact tube sockets,
premium hookup wire,
premium TRT Wondersolder,
premium Janzen Superior Z Caps after studying some in-depth cap review's.
I also used premium resistors throughout.

Attached are receipts and correspondence with some knowledgeable parts suppliers. One supplier had me send him the schematic and he identified which types of resistors, carbon film, metal film, etc sounded best at any point in the circuit. The guy knew his stuff!!! The mods were done in 2011 as evidenced by the receipts. I think I can also provide the schematics if you need them.

The last attachment is a curious survey of high quality capacitors that evaluates all the caps from each manufacture and rates them on a scale of 1-10. The author provides a brief introduction to capacitor basics, sourced partially from the British hifi engineer and editor, Martin Colloms,  on materials and the construction of caps as well as the sonic effects of microphonics. It’s hard to imagine how much time & effort it took to tediously amass so much specific knowledge on such a narrow subjective pursuit. Nevertheless his comments seemed authentic & they enabled me to select capacitors that happened to also get high praise from other sources and yet were not too pricey.

These Theta tube amps are a push-pull design, with a power rating of 60 W/ch using 6550 output tubes. They were fully restored in 2011 with premium parts (listed below in a PDF}: Jantzen Superior Z caps, precision 1% carbon film & metal film resistors in the signal path, new high quality Nichikon electrolytic filter caps for a refreshed and more muscular power supply, new premium ceramic tube sockets with gold-plated contacts, new tubes, premium hookup wire on the circuit boards & TRT Wonder Soldier to make all the connections. The amps have IEC sockets and come with power cords but it is assumed that the buyer can upgrade to his or her choice of cords at any time. They perform very much like MacIntosh’s MC60's, at a fraction of the price. The black anodized aluminum cages, and really all the chassis surfaces inside & out are clean and in superb condition with no dings or scratches. This is also true for the the transformers and circuit boards. 

Historical Background:

Mike Moffat who was the founder of Theta, Angstrom, and most recently Schiit Electronics, designed and manufactured his Theta tube mono amps and preamp in the 1970s in Clearwater, FL. Like many aspiring audio designers back then Mike's first design efforts were modifications of Dynaco Mark III’s. But his inspirations were Marantz 8’s and Harmon Kardon Citation 2’s for their refined circuits and extended frequency response. Accordingly, Mike was the first to use 6DJ8 tubes in his preamp giving it a very extended bandwidth. He early on discovered the benefits of premium capacitors in the signal path and was quick to use film & foil polypropylene capacitors from Reliable Capacitor Corporation also known as REL Cap.

A list of the parts used in these tube amps is included to give the buyer a sense of the quality that was added in their upgrade. Also included is a PDF of an in-depth review of the most respected and sought after capacitors used in audio products. Other reviews were studied and their consensus was that Jantzen Superior Z Caps compared very favorably with the Mundorf Supremes so the Jantzens were selected for all signal paths."

The above mentioned cap tests and receipts are available upon request, no need for it in the ad. 

Offered for $2500 plus $160 domestic shipping. Guaranteed to play correctly and be as described. Always over-packed and insured.

In stock and ships next day. _________________________________________________________ 

Revised shipping policy as of September 20, 2017.
Due to items lost or damaged in shipping, any item over $50.00 in 
cost will require delivery confirmation and insurance for the sale 
amount. It is unfortunate that this is necessary but experience has 
proven it is well worth the small extra cost. We apologize for this, but 
it is for the good of all involved.
TERMS: 
All listings are plus shipping unless noted. 7.00% sales tax added 
to all In-state destinations. This unit is guaranteed to be in "as 
described" working condition (unless otherwise noted) upon arrival and 
has a 60 day limited warranty, baring any abuse. 15% restocking fee on 
all returns unless defective or "not as described"
SHIPPING: 
We ship internationally on smaller items . Domestic packages are 
shipped via Fed Ex. All international shipping quotes will include 
insurance and delivery confirmation. Shipping charges reflect actual 
cost of shipping, plus a nominal fee for packaging materials.
INSURANCE: 
International shipments to countries that do not allow insurance, 
buyer assumes FULL RESPONSIBILITY for the safe shipment of their 
packages. Sound Ideas cannot provide refunds or compensation for 
packages shipped without shipping insurance. All shipping quotes for 
packages shipped includes insurance.
RETURNS: 
Any item may be returned within 15 days for a full refund of the 
purchase price, not including shipping, unless otherwise stated in the 
ad. It must arrive back at our store in the same condition as 
sent. 15% restocking fee on new items that were opened.
international purchases need to be returned with incoming custom's 
duty prepaid, if any. Any postage or import duty that is due upon 
arrival will be deducted from the refund. 15% restocking fee also on all 
returns unless defective or "not as described."
Thank-you for your time and interest!!

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