ECC82 Pair SILVER plate Siemens Germany (V272/273)

Description

ECC82 Pair SILVER plate Siemens Germany (V272/273)
Highlights
Silver plates
Excellent vocal reproduction
Double post halo getter
Copper grid posts
Ultra rare Silver plate ECC82 twin triodes, made by Siemens & Halske in Munich; Germany
Description
This is a pair ECC83 twin triodes is produced
by the Siemens & Halske factory in Munich, Germany
. The tubes have a
double post ring getter
and
silver plates
, see pictures.
Very healthy new old stock tubes!
The tubes test and look unused
.
Note
:
my tubes are often not the cheapest.
But is
hard to find better tubes !
Sonics
The silver plate
Siemens & Halske are sought after for their sonic performance
!
It has a sound character that is very similar to the the Mullard long plates. Liquid midrange, solid low, sparkling high notes and very 3-dimensional.
Excellent preamp valve, low noise, very good in phono stages. Balanced and smooth sounding with clear vocals,, recommended!
Test results
:
The me
asurement data below show that both systems are
p
recisely matched and balance
d.
.
And fully in line with the TELEFUNKEN specification for a NOS-tube
.
Valve1
(227)
System 1/2
Ia (plate current):
9,9 mA
/
10.0 mA
=
NOS / NOS
Mutual conductance:
2,2 / 2,2  mA/V
=
NOS / NOS
Gas test, Shorts test:
OK
Valve 2
(228)
System 1/2
Ia (plate current):
9,9 mA
/
9,5 mA
=
NOS / NOS
Mutual conductance:
2,2 / 2,1  mA/V
=
NOS / NOS
Gas test, Shorts test:
OK
Factory Specification for new unused tubes (
Telefunken/Philips/etc.)
The emission value for a new
premium ECC82
(
ECC802S
) is:
10,6 ± 1,9 mA
The transconductance value for a new
premium ECC82
is:
1,8 till 2,7 mA/V
When the test results are obtained with the test-setup that is specified by Telefunken
(
for factory specification see last picture)
Test condition &
equipment
:
Mutual transconductance
,
Gas and shorts test equipment
:
AVO CT-160 (Dutch army tester) ,
AVO Valve Data Manual 23rd edition 1981, RFT stabilised mains and Utracer3+.
Ia (plate current) test equipment
:
Utracer3+,
RFT stabilised mains, Philips PE 4832,
2x Korad KA3005P programmable power supply
and
2x
Keithley 2700.
Test conditions:
Ua (plate voltage) = 250 Volts,
Rk = 0,8 kOhm and Uf = 6,3 V ± 5% (Telefunken test-setup).
Note
:
Look for a detailed description of testing methods on the site:
tubes4hifiaudio.ctpu.nl/
tube-testing-quality-control/
Summarized description
Tube type
ECC82
Quantity of Tubes
One pair
Brand
Siemens & Halske
Manufactured in
Munich Germany
Dates
1962/1962 (codes:
± 2C
&
± 2C)
Construction
Silver coloured plates, copper grid posts
Getter Construction
Double post O-getter
Print Condition
Very good; see pictures
Box included
new white box
Equivalent tubes:
12AU7, ECC802S, CV4003, 12AU7WA, 5814A, CV491
General test results
NOS
Please study photos carefully; what you see is what you get! A
sk any questions before bidding. Thanks
—————————————————————
Shipping
I
ship
worldwide
.
Shipping costs for countries
outside Europe, if not shown,
are supplied on request.
Shipping on buyer's risk.
Due to previous bad experience, no shipping to Italy or Singapore.
Product is sold as is.
Private sale.
Test results may vary on your test equipment.
I cannot offer any guarantee or warranty.
I will pack the item very carefully.
Shipping with tracking.
If you prefer insured shipping or another shipping option please contact me !
Payment
Bank transfer preferred;
Payment within 5 days after auction ending.
We are located in Holland (Europe) so for customers within the Eurozone the easiest and cheapest way to pay is via an international bank transfer (IBAN).
P
aypal outside the EU
.
Cus
tomers
outside the Eurozone can pay with PayPal.
We are not a company, shop or other business. We therefore cannot accept any other form of payment like credit card etc. Sorry!
Sellers Note
I will offer a full take-back with
complete refund
of the purchase price ( not the shipping costs) within 14 days after delivery if the product is dead on arrival!
Conditions for a take-back: Item must be returned unused (except a short listening test, of course) with functioning heater filament and visible undamaged and with original packaging. Shipment back to me will be made on buyer’s risk only. Money-back transfer for take-back will only be made via PayPal after the tubes safely arrived back here.
_gsrx_vers_841 (GS 7.0.16 (841))