Exhibit 12.1

CPI INTERNATIONAL HOLDING CORP.

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

(in thousands)

		Successor(a)												Predecessor(a)
		Year Ended									Period February 11 to			Period October 2, 2010 to			Year Ended
		October 3, 2014			September 27, 2013			September 28, 2012			September 30, 2011			February 10, 2011			October 1, 2010
Earnings calculation:
Income (loss) before taxes		$	16,813		$	16,295		$	7,100		$	(8,549	)	$	(3,747	)	$	12,361
Add Back: Fixed Charges		33,528			28,291			28,218			18,305			6,118			16,046
Calculated Earnings		$	50,341		$	44,586		$	35,318		$	9,756		$	2,371		$	28,407
Fixed charges calculation (b)
Interest expense (c)		$	32,182		$	27,237		$	27,230		$	17,708		$	5,788		$	15,213
Interest expense portion of rental expense		1,346			1,054			988			597			330			833
		$	33,528		$	28,291		$	28,218		18,305			6,118			16,046
Ratio: Earnings / Fixed charges (d)		1.50			1.58			1.25			—			—			1.77
Interest expense portion of rental expense:
Rental expense		$	4,037		$	3,163		$	2,965		$	1,791		$	990		$	2,500
Estimated Interest Cost		33		%	33		%	33		%	33		%	33		%	33		%
Calculated total		$	1,346		$	1,054		$	988		$	597		$	330		$	833
(a)	For periods prior to the February 2011 merger with The Veritas Capital Fund IV, L.P., the term “Predecessor” refers to CPI International, Inc. and its consolidated subsidiaries, and, for periods after the said merger, the term “Successor” refers to CPI International Holding Corp. and its consolidated subsidiaries.
(b)	Fixed charges exclude capitalized interest; capitalized interest is zero.
(c)	Includes normal debt issue amortization costs, but does not include gain or loss on debt extinguishment.
(d)	For the periods February 11, 2011 to September 30, 2011 and October 2, 2010 to February 10, 2011, earnings were not sufficient to cover fixed charges by $8,500 and $3,700, respectively.