Hallicrafters HT-37

Name: Hallicrafters HT-37
Brand: Hallicrafters
Availability: InStock

The HT-37 is a self-contained SSB, AM and CW transmitter for 80 through 10 m, with its own VFO and power supply in one 18-tube cabinet. Wikipedia describes it as a lower-cost follow-on to the HT-32 of 1957, introduced in 1959. It generates SSB by the phasing method, building the signal at one carrier frequency and mixing it up to each band. The output pi-network needs only a tuning control, with no separate loading knob. Two 6146 tubes in parallel deliver 70 to 100 W on SSB and CW. It can be a whole transmitter on its own or an exciter for a linear such as the Hallicrafters HT-33A. Its manual's hookup diagram pairs it with the SX-100, SX-101A or SX-111 receivers.

HT-37

Spec at a glance

Maker: Hallicrafters
Type: Transmitter
Launched: 1959
Covers: 80, 40, 20, 15 and 10 m
Modes: SSB (phasing), AM, CW
Power out: 70–100 W SSB and CW; 17–25 W AM
Finals: Two 6146 in parallel, pi-network output
Tubes: 18, including a regulator and two rectifiers
Power supply: Built in, 105–125 V AC, about 375 W
Weight: 80 lb shipping
Also listed as: HT37, HT-37, HT 37
Typical eBay ask (Oct 15, 2026): $240–$350

Bench check

Power, receive, finals and supply

Transmit power: Hallicrafters rates it at 70 to 100 W out on SSB and CW and 17 to 25 W on AM. Ask for a wattmeter reading into a 50-ohm dummy load on 80, 40, 20, 15 and 10 m. A set that only lights up hasn't proved its finals.
Finals: Two 6146 beam tubes in parallel into a pi-network. The manual says they run close to their rated plate dissipation, and asks for occasional bias checks with an accurate 20,000 ohms-per-volt meter. Ask for the bias and plate-current readings the seller saw.
Power supply: The power supply is inside, running on 105 to 125 V AC at about 375 W, with two rectifiers and a regulator among its 18 tubes. A 4 A slow-blow fuse protects it. Shipping weight was 80 pounds, so ask how it'll be packed.
Dial and display: A self-contained VFO sets the frequency on every band through mixing circuits, and the dial lamps and tubes are reached from the top. Ask whether the dial lights and turns smoothly, and how close it reads to a known frequency on a receiver.
Filters and options: There are no plug-in filters. The phasing generator relies on balance controls and an audio phase-shift network, and Hallicrafters rates the unwanted sideband at 40 dB or more down. It also has VOX, anti-trip and an 11-pin accessory socket for station control.

Should come with it

The 11-pin accessory plug Hallicrafters supplied
A high-impedance mic with an Amphenol 75-MC1F plug
The operating and service manual

Check the listing photos against this list, and ask the seller about anything you can’t see. A missing piece should come off the price.

What to check

Hallicrafters runs the 6146 finals close to their rated plate dissipation, so the manual asks for regular bias checks to protect tube life. Ask whether the bias was set recently and whether the finals are original. Its electrolytic capacitors are the replace-first job Phil's Old Radios describes for any set this old.

01Power out: Ask for a wattmeter reading into a 50-ohm dummy load on all five bands. 70 W or more on SSB or CW is what Hallicrafters rated.
02Finals and bias: Ask when the 6146 bias was last set and whether the tubes are original. A recent bias check is what the manual asks for.
03Sideband check: Ask the seller to listen on a receiver while switching sidebands. The unwanted sideband should be far weaker than the wanted one.
04VFO dial: Ask whether the VFO dial lights and turns smoothly. It should read close to the frequency a receiver shows.
05Capacitors: Ask whether the electrolytic capacitors have been replaced. Photos of the new parts are what you want.
06Microphone: Ask whether a mic and its Amphenol 75-MC1F plug come with it. It needs a high-impedance communications mic.
07Accessory plug: Check for the 11-pin accessory plug Hallicrafters supplied. It carries the station-control connections.
08Manual and model: Read the badge for HT-37 and ask whether the manual is included. The HT-32 is an earlier model with a similar look.

New to used rigs? How to check a used ham radio covers power out, receive, the finals and the display, and buying vintage tube gear covers old capacitors, tubes and first power-up.

Buying guide

Which one to buy

§ Oct 15, 2026

We'd ask about gregsstuff's HT-37 at $230 delivered, under the $240 to $350 band from a 99.7% seller, because it's the cheapest one with any claim in the title, though powers up doesn't prove the 6146 finals. There are at least 8 for sale and none is titled tested on the air, so ask for a wattmeter reading into a 50-ohm dummy load on 80 through 10 m, where Hallicrafters rated 70 to 100 W on SSB and CW, and when the bias was last set. Shipping runs as high as $150 on a set Hallicrafters shipped at 80 lb, and cloudysponger's $150 ask quotes none, so get a quote before you count it as cheap. You don't need a license to own one, but transmitting on the ham bands needs an amateur license.

Listed now: 8
For parts: 1
Typical ask: $240–$350
Full range: $99–$300

Cheapest
$229.98est. delivered
The cheapest HT-37 with any claim in the title, powers up, at $230 delivered. That doesn't prove the transmitter, so ask for a wattmeter reading into a dummy load, and look at the spots on the top cover in the photo.
Hallicrafters HT-37 Ham Radio HF Transmitter Vintage 1960s - POWERS UP
View on eBay ↗: Hallicrafters HT-37 Ham Radio HF Transmitter Vintage 1960s - POWERS UP$229.98 est. delivered

Delivered prices include shipping as eBay quoted it to a US address on Oct 15, 2026. Many sellers charge by distance, so your total may differ. eBay shows yours before you pay.

Snapshot

For sale on eBay

8 of 8 listed

Checked Oct 15, 2026. Some may have sold.

Delivered prices include shipping as eBay quoted it to a US address on Oct 15, 2026. Many sellers charge by distance, so your total may differ. eBay shows yours before you pay.

Used
- Cheapest
Hallicrafters HT-37 Ham Radio HF Transmitter Vintage 1960s - POWERS UP
$229.98est. delivered
$129.99 + $99.99 shipping
Buy It Now$129.99
Good buy
Titled powers up. Photo shows spots on the top cover.
Seller: gregsstuff
99.7% positive
View on eBay ↗: Hallicrafters HT-37 Ham Radio HF Transmitter Vintage 1960s - POWERS UP
Used
Hallicrafters HT37 Ham Radio Transmitter Vintage
$184.00est. delivered
$99.00 + $85.00 shipping
Buy It Now$99.00
Offers accepted
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Our take
No claim in the title.
Seller: anzubie0
99.7% positive
View on eBay ↗: Hallicrafters HT37 Ham Radio Transmitter Vintage
Used
Vintage Hallicrafters HT-37 Ham Radio Transmitter
$284.62est. delivered
$170.00 + $114.62 shipping
Buy It Now$170.00
Offers accepted
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Our take
No test claim. Photo shows the meter lamp lit.
Seller: diogenes425
99.9% positive
View on eBay ↗: Vintage Hallicrafters HT-37 Ham Radio Transmitter
Used
Hallicrafters HT-37 Vintage Amateur Radio Transmitter Ham
$300.00delivered
$300.00 · free shipping
Buy It Now$300.00
Offers accepted
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Our take
No test claim. Free shipping.
Seller: amali-9304
100% positive
View on eBay ↗: Hallicrafters HT-37 Vintage Amateur Radio Transmitter Ham
For parts
Nice Used Original Vintage Hallicrafters Model HT-37 Transmitter HAM SWR *Repair
$324.98est. delivered
$174.99 + $149.99 shipping
Buy It Now$174.99
Offers accepted
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Our take
Titled for repair, so treat it as needing work.
Seller: c200fish
99.3% positive
View on eBay ↗: Nice Used Original Vintage Hallicrafters Model HT-37 Transmitter HAM SWR *Repair
Used
Vintage Hallicrafters HT-37 Ham Radio HF Transmitter - Powers On & Lights Up
$359.99est. delivered
$299.99 + $60.00 shipping
Buy It Now$299.99
Offers accepted
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Our take
Titled powers on and lights up. Not a power-out claim.
Seller: afootrecords
100% positive
View on eBay ↗: Vintage Hallicrafters HT-37 Ham Radio HF Transmitter - Powers On & Lights Up
For parts
Hallicrafters HT-37 Ham Radio HF Transmitter Vintage 1960s / POWERS ON UNTESTED
$379.71est. delivered
$250.00 + $129.71 shipping
Buy It Now$250.00
Offers accepted
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Our take
Titled powers on but untested.
Seller: thesavvys93
100% positive
View on eBay ↗: Hallicrafters HT-37 Ham Radio HF Transmitter Vintage 1960s / POWERS ON UNTESTED
Used
Vintage Hallicrafters HT-37 Ham Radio HF Transmitter
$150.00+ shipping
$150.00 · shipping not stated
Buy It Now$150.00
Offers accepted
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Our take
No shipping quoted; ask. No test claim.
Seller: cloudysponger
100% positive
View on eBay ↗: Vintage Hallicrafters HT-37 Ham Radio HF Transmitter

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Brand

Type

Launched

Read

Hallicrafters HT-37

HT-37

Spec at a glance

Maker

Hallicrafters

Type

Transmitter

Launched

1959

Covers

80, 40, 20, 15 and 10 m

Modes

SSB (phasing), AM, CW

Power out

70–100 W SSB and CW; 17–25 W AM

Finals

Two 6146 in parallel, pi-network output

Tubes

18, including a regulator and two rectifiers

Power supply

Built in, 105–125 V AC, about 375 W

Weight

80 lb shipping

Also listed as

HT37, HT-37, HT 37

Typical eBay ask (Oct 15, 2026)

$240–$350

Power, receive, finals and supply

Transmit power

Hallicrafters rates it at 70 to 100 W out on SSB and CW and 17 to 25 W on AM. Ask for a wattmeter reading into a 50-ohm dummy load on 80, 40, 20, 15 and 10 m. A set that only lights up hasn't proved its finals.

Finals

Two 6146 beam tubes in parallel into a pi-network. The manual says they run close to their rated plate dissipation, and asks for occasional bias checks with an accurate 20,000 ohms-per-volt meter. Ask for the bias and plate-current readings the seller saw.

Power supply

The power supply is inside, running on 105 to 125 V AC at about 375 W, with two rectifiers and a regulator among its 18 tubes. A 4 A slow-blow fuse protects it. Shipping weight was 80 pounds, so ask how it'll be packed.

Dial and display

A self-contained VFO sets the frequency on every band through mixing circuits, and the dial lamps and tubes are reached from the top. Ask whether the dial lights and turns smoothly, and how close it reads to a known frequency on a receiver.

Filters and options

There are no plug-in filters. The phasing generator relies on balance controls and an audio phase-shift network, and Hallicrafters rates the unwanted sideband at 40 dB or more down. It also has VOX, anti-trip and an 11-pin accessory socket for station control.

Should come with it

The 11-pin accessory plug Hallicrafters supplied

A high-impedance mic with an Amphenol 75-MC1F plug

The operating and service manual

Check the listing photos against this list, and ask the seller about anything you can’t see. A missing piece should come off the price.

What to check

01Power out: Ask for a wattmeter reading into a 50-ohm dummy load on all five bands. 70 W or more on SSB or CW is what Hallicrafters rated.

02Finals and bias: Ask when the 6146 bias was last set and whether the tubes are original. A recent bias check is what the manual asks for.

03Sideband check: Ask the seller to listen on a receiver while switching sidebands. The unwanted sideband should be far weaker than the wanted one.

04VFO dial: Ask whether the VFO dial lights and turns smoothly. It should read close to the frequency a receiver shows.

05Capacitors: Ask whether the electrolytic capacitors have been replaced. Photos of the new parts are what you want.

06Microphone: Ask whether a mic and its Amphenol 75-MC1F plug come with it. It needs a high-impedance communications mic.

07Accessory plug: Check for the 11-pin accessory plug Hallicrafters supplied. It carries the station-control connections.

08Manual and model: Read the badge for HT-37 and ask whether the manual is included. The HT-32 is an earlier model with a similar look.

New to used rigs? How to check a used ham radio covers power out, receive, the finals and the display, and buying vintage tube gear covers old capacitors, tubes and first power-up.

Hallicrafters HT-37

Spec at a glance

Power, receive, finals and supply

What to check

Which one to buy

For sale on eBay