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Siemens CCa


Product Description

Siemens CCa - Made in West Germany. Impossible? This is the real deal... Super select 6922 variant. The rarest of the rare, and very hard to get preamp graded ones, so don't bust my nuts on the price. These were in bulk packs so come in generic white boxes. Most are branded Siemens.

If you're looking for this tube in Gold or Platinum Grade for use in a preamp or phonostage, please call to confirm compatibility. Some preamps can be a little hard on this tube, and we want to be up-front with you.

If used in a preamp or phonostage, you may hear a slight "ting!" through your speakers when you move switches, or tap on the unit. This is normal.

Platinum grade - The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.

Gold grade - Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.

Driver grade - Lowest noise but not the lowest in microphony. Triode balance will be similar to Gold grade.
This grade is only suitable for use in the driver stage of an amplifier, or the output/buffer stage of a DAC or CD Player.

If you have a preamp or phonostage, you need at least Gold grade.

Click here for a more in depth discussion on how we grade tubes.

Price includes matching in any quantity you need at no extra charge.

Warranty Information

Vacuum tubes are warranted for 90 days against defects, except in cases of abuse, and replaced with like-item only.

Vacuum tubes are warranted for 90 days against defects, except in cases of abuse, and replaced with like-item only.

  • Tubes being sent in for warranty must have a return authorization number from Upscale Audio. This RA number must be written on the outside of the box. Please also include a note in the box that has your name and telephone number, and please explain the issues with the tube. If this information is missing it will delay the shipment of your replacement tube.
  • Vacuum tubes being sent to Upscale Audio for warranty replacement must be shipped in a box with appropriate packaging to keep them from being damaged. Vacuum tubes returned to Upscale Audio using inadequate packing will have a voided warranty and will be refused at the customer's expense.

Exceptions to our warranty policy are as follows:

  • Upscale Audio reserves the right to refuse warranty at our disgretion based on the equipment being re-tubed. You will be notified of any change prior to your order being processed.
  • Using a tube in an application in which it was not meant to be used. If your amp calls for a 6550, and you decide you want to plug in a 6V6GT, Upscale Audio is not liable if the tube fails, and will not honor any warranty in such a situation.

Upscale Audio is not liable for any damage or injury caused by the improper use of its tubes or the use of an incorrect/incompatible tube type. If you are unsure of what tube or tubes your equipment uses, consult the manufacturer before making a purchase. Using an incompatible tube type may cause severe damage to your equipment and will void your tube's warranty.

vacuum tube returns for refund:

Vacuum tubes are electronic parts and are not refundable under any circumstances.

Product Reviews

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  1. A Sound Investment

    Posted by Unknown on 23rd Aug 2013

    Well worth the money. I'm using this in the output of my DIY DAC. I've used other NOS and OS as well as new and new re-issues. The detail this tube is able to retrieve is stunning. Highly musical as well and highly recommended.

  2. Siemens CCA plus Amperex PQ

    Posted by Bret Miller on 11th Apr 2013

    I had 4 x Siemen Halske 1950's era from Cryoset in my Blue Circle BC3000 with outboard GzPz power supply, then 4 x Amperex PQ that I got off Audiogon. I settled on two of each type. Somehow my preamp went out and the tubes were measuring bad or very weak- I was told by the BC repair guy. Retubing with 2 of each and they sound marvelous in my tri-amp system. The Siemens seem to have finer detail and the PQ have a little more musicality- though they both give stunning detail. The best thing about Upscale is you can really trust that they are giving you what you pay for- well screened and tested. I wonder if those PQ tubes from Audiogon tubes were not as they were rated ( I don't have a tube tester).

  3. Most high resolution ecc88 of them all!!!

    Posted by Zigis on 18th Sep 2012

    The resolution power of this gray shield Siemens CCa is unbelievable. This tube alone is capable to completely transform equipment into 2-3 times more expensive sounding... Because of it's ultra analytic nature I use it in combination with Dario Miniwatt or Mullard CV2493. Then it is match made in heaven (resolution + musicality at the highest level).

  4. Sounds Great in Cavalli Liquid Fire Amp.

    Posted by Unknown on 6th Jul 2012

    Simply awesome. Highly recommended, the best tube in the 6922 family I have heard.