Description
Pair: Valvo ECC83 made in the Hamburg plant; February & March 1961
This is a pair Valvo ECC63 produced in Hamburg Germany. They have a tilted small o-getter.
The Hamburg production is highly regarded. Very healthy tubes with matching systems; see test results.
Sonics
The acoustic properties of the early Hamburg production are legendary and widely known. I refer to the many threads on the web for more information. Excellent preamp valve, low noise, very smooth extended highs, very good in phono stages. Balanced and smooth sounding with liquid midrange, recommended!
Test results*
| Code | Ia1 (mA) | Ia2 (mA) | Gm (mA/V) | Gm2 (mA/V) | |
| Tube 1 (V47) | I60 D1B | 1,36 | 1,55 | 1,65 | 1,77 |
| Tube 2 (V48) | I60 D1C | 1,16 | 1,19 | 1,55 | 1,62 |
Tested for leakage and gas.
* Where 100% is : Ia = 1,2 mA, Gm= 1,6 mA/V.
Test methods are outline on the Tube testing page, for test conditions see Category Page.
Short description
| Tube type | ECC83 |
| Quantity of Tubes | One pair |
| Brand | Valvo |
| Manufactured in | Hamburg Germany |
| Dates | February 1961 & March 1961 |
| Construction | creases on the top of the bottle |
| Getter Construction | 45° o-getter |
| Print Condition | good; see pictures |
| Box included | new white box |
| Equivalent tubes: | 12AX7, ECC803S |
| General test results | NOS specs |
