For each of the instruments described below I have listed the prices shown in the GR catalogs in my collection.  Catalog O (Jun-1956) and Catalog T (Feb-1968) are online at the BoatAnchor Manual Archive.

As with many of the instruments in my shop the Type 605-B is overkill for working on old radios.  A standard signal generator is the laboratory grade equivalent of an RF oscillator.  It differs from the latter in several respects.  Three important parameters are both accurate and subject to fine control - frequency, output level and modulation level.  The 605-B covers 9.5 kHz to 30 MHz in seven ranges with an accuracy of 1%.  An eighth range covering 30 MHz to 50 MHz is included, but performance is not guaranteed for that range.  Step and variable attenuators and an output meter provide accurate output voltages from 0.5 μV to 0.1 V, and an additional output provides 1 V.  Modulation can come from the internal 400 Hz oscillator or an external oscillator, and is metered and continuously adjustable from 0% to 80%.  A motor-driven variable capacitor can be connected to provide frequency modulation or sweep.  I've owned and used my Type 605-B since the late 1970s, but it has been replaced on my bench by the newer (and more sophisticated) Type 805-C.  The illustration is from the Type 605-B manual.  The manual for the older but very similar Type 605-A is online at the BoatAnchor Manual Archive.  You can download the factory Service and Maintenance Notes for the 605-A and 605-B.  This file (513 kb) contains GIF images of seven pages.

This is perhaps the ultimate in tubed signal generators for the AM broadcast and shortwave bands, and at 117.5 pounds must be one of the heaviest.  It covers 16 kHz to 50 MHz in seven ranges.  Frequency calibration is ±1%, and, after warm-up, frequency drift is less than ±0.1% over five hours.  The output meter and attenuator provide continuously adjustable output from 0.1 μV to 2 V.  Metered AM modulation can come from the internal 400 Hz and 1 kHz oscillators, or from an external high-power oscillator.  Because the the modulated stage is a buffer, rather than the oscillator, modulation up to 100% can be attained with negligible incidental frequency modulation in the output.  Prices in GR catalogs: L (1948) $1,350.00, M (Oct-1951) $1,450.00, N (Jan-1954) $1,495.00, O (Jun-1956) $1,650.00, P (Apr-1959) $1,750.00, Q (May-1961) $1,975.00.

This instrument cover UHF frequencies from 250 MHz to 940 MHz in one band.  Frequency accuracy is 1%.  Voltage output is continuously adjustable from 0.5 μV to 1 V.  AM modulation from 0 to 50% can be provided by the internal 1 kHz oscillator or an external high-output oscillator.  Prices in GR catalogs: M (Oct-1951) $615.00, N (Jan-1954) $615.00, O (Jun-1956) $640.00, P (Apr-1959) $700.00, Q (May-1961) $725.00, R (May-1963) $795.00, S (Jul-1965) $795.00.

The Type 1330-A is designed for use as a signal source for GR bridges such as the Type 1606-A RF Bridge.  Frequency coverage is from 5 kHz to 50 MHz in eight ranges, as well as at fixed frequencies of 400 Hz and 1 kHz and the power line frequency.  Frequency accuracy is ±2% above 150 kHz.  Open circuit AF output is 12 V, and maximum power into a 50 Ω load is about ¾ W.  Open circuit RF output voltage is adjustable, about 10 V at middle frequencies, and maximum power into a 50 Ω load is 1 W.  400 Hz and 1 kHz internal modulation is provided at 25% and 50%.  Prices in GR catalogs: M (Oct-1951) $525.00, N (Jan-1954) $525.00, O (Jun-1956) $540.00, P (Apr-1959) $575.00, Q (May-1961) $635.00, R (May-1963) $690.00, S (Jul-1965) $735.00, T (Feb-1968) $995.00, U (Feb-1970) $1,150.00, 73 (Nov-1972) $1,225.00.

This is one of a set of instruments that I occasionally use for work - see Vintage Instruments In Action.