Vacuum tube based audio amplifier

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Description

FIG. 1 is an isometric view of the vacuum tube based audio amplifier of the present invention;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view of the invention, as seen from the right side of FIG. 2;

FIG. 5 is a side view of the invention, as seen from the left side of FIG. 2; and,

FIG. 6 is a top plan view thereof.

The stippling in the Figures on the front face and the transformer devices represents a pastel color and while shown intermittently is understood to be extended uniformly across the entire surface upon which it is applied.

The wood-pattern lines shown in the Figures indicate that the surface portions of the amplifier comprise a wood appearance. The specific wood grain pattern depicted in the figures is for illustrative purposes only.

The broken-line disclosure in the views is understood to form part of the claimed design.

Claims

The ornamental design for a vacuum tube based audio amplifier, as shown and described.

Referenced Cited
U.S. Patent Documents
1905276 April 1933 Erickson
2497747 February 1950 Valdettaro
D371787 July 16, 1996 Sohn
D489705 May 11, 2004 Sabnani
D508478 August 16, 2005 Nakajima
D525613 July 25, 2006 Masui
D598004 August 11, 2009 Lam
D669992 October 30, 2012 Schafer et al.
D678863 March 26, 2013 Inada
D702211 April 8, 2014 Kim
D702663 April 15, 2014 Kim
D713379 September 16, 2014 Kim
D729762 May 19, 2015 Hu et al.
Patent History
Patent number: D813189
Type: Grant
Filed: Aug 10, 2017
Date of Patent: Mar 20, 2018
Inventor: Eric J. Lundgard (Midland, MI)
Primary Examiner: Keli L Hill
Application Number: 29/613,548